BRS Bulk Kalkwasser (Calcium Hydroxide) Aquarium Supplement

BRS Bulk Kalkwasser (Calcium Hydroxide)
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Quick Overview

Dosing with BRS Bulk Kalkwasser is one of the very few proven, effective methods to add calcium and alkalinity with a single product while maintaining pH at an affordable price. Commonly used in conjunction with auto top off systems. BRS Bulk Kalkwasser is produced with the highest quality material available to the aquarium industry.


USING KALKWASSER


  1. Before dosing Kalkwasser, it is necessary to test and raise calcium and alkalinity levels to their correct levels. We suggest using Calcium Chloride and Sodium Bicarbonate. Kalkwasser should not be used for this because, in large doses, it will significantly raise pH.

  2. Use the BRS Reef Calculator to determine proper bicarbonate and calcium chloride amounts to adjust alkalinity and calcium.

  3. Maintain new levels with Kalkwasser using an Auto Top Off System.

See Full Details for more information on Kalkwasser, Calcium Chloride, Sodium Bicarbonate and Magnesium Mix and their effects on your tank.


More
  • Quick Overview

Dosing with BRS Bulk Kalkwasser is one of the very few proven, effective methods to add calcium and alkalinity with a single product while maintaining pH at an affordable price. Commonly used in conjunction with auto top off systems. BRS Bulk Kalkwasser is produced with the highest quality material available to the aquarium industry.

USING KALKWASSER

  1. Before dosing Kalkwasser, it is necessary to test and raise calcium and alkalinity levels to their correct levels. We suggest using Calcium Chloride and Sodium Bicarbonate. Kalkwasser should not be used for this because, in large doses, it will significantly raise pH.
  2. Use the BRS Reef Calculator to determine proper bicarbonate and calcium chloride amounts to adjust alkalinity and calcium.
  3. Maintain new levels with Kalkwasser using an Auto Top Off System.

See Full Details for more information on Kalkwasser, Calcium Chloride, Sodium Bicarbonate and Magnesium Mix and their effects on your tank.More

BRS Bulk Kalkwasser (Calcium Hydroxide) Aquarium Supplement

98% Recommend this to a friend (114 of 116)

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Product Questions

I don't have a,auto top off, how would I dose then?
Question by: Rick Linboom on Nov 4, 2013 1:36:00 PM
Hi Rick,
If you don't have an auto top off (which I would highly recommend) then your going to need a kalk dripper of some sort. Check out this video we made on making your own kalk dripper.

http://www.youtube.com/watch?v=LhcuEQpLIfc
Answer by: Bulk Reef Supply on Nov 4, 2013 1:36:00 PM
Do you ship Kalkwasser into Canada?
Question by: Scott on Aug 1, 2014 2:26:00 PM
Hi Scott,
Things with customs can change rapidly, but at this time we don't have any issues sending Kalkwasser to Canada.
Answer by: Bulk Reef Supply on Aug 1, 2014 2:26:00 PM
Does kalkwasser actually raise levels? Or just maintain your levels? I'm being told both.
Question by: Joseph on May 5, 2014 11:06:00 AM
Hi Joseph,
Technically you have to raise the levels to maintain the levels (maintaining really just means your increasing the levels at the same rate its being consumed). The confusion comes from the fact that kalk would be a poor choice to try and raise the levels by more then that because of its significant pH effect. If you added enough kalk to say raise your tanks calcium from 400 to 450, you would also raise the pH to catastrophic levels. It also suppliments both calcium and alkalinity, so you can't raise one without messing with the other. Two part would be what you want for adjusting levels.
Answer by: Bulk Reef Supply on May 5, 2014 11:06:00 AM
The ph in my ro/di water that I use in my ato is around 6.5. Will this be a good product to use in it to help bring my ph up. So that I can keep the ph up in my tank?
Question by: Danny Baker on Mar 3, 2016 3:13:00 PM
Great question!
You will want to measure after you have mixed in your salt mix to make sure. RO/DI water will always have around 7.0 pH. Feel free to let us know if you have any further queations!
Answer by: Connor (Admin) on Mar 3, 2016 5:47:00 PM
I use instant ocean reef crystals and habe ph issues never goes above 7.7-7.8 I know its not necessarily important for 8.3-8.4 but would like to try closer then I am. I think calcium is on the high side in IORC but can't remember dkh and never tested mag what should I do I have also heard kalk goes a long way and helps algae maybe?
Question by: troy long on Feb 7, 2016 11:55:00 PM
Great question!
We do not recommend using supplements for initial control of pH rather introducing fresh air through the skimmer may help! Some supplements such as Soda ash (alkalinity) and Kalkwasser do have increasing effects on pH but should not be used for that sole purpose. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Feb 10, 2016 5:57:00 PM
If dosing Kalk in a ATO once you've got your appropriate levels using two-part, how often do you need to dose additional two-part while the Kalk is maintaining your levels? Is it worth it to have an automatic two-part dosing system along side of Kalkwasser or will you be adding Calcium Chloride and Sodium Bicarbonate so rarely that you might as well do it manually?
Question by: Bill on May 9, 2016 4:43:00 AM
Great question!
It will vary depending on your system demand. Typically on smaller systems we will test once every 2 weeks and dose 2 part to increase the levels as needed. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on May 11, 2016 5:31:00 PM
I know the average rate of my evaporation is about 1gal/day. I was thinking of mixing kalkwasser with RODI and program the doser to put in 1gal/day over 24hrs.
I would use a 9gal container, so I would only have to change it evey 9days.
What ratio of RODI to Kalwasser would you recommend?
Is that a good or bad idea?
Haven't had luck with any ATO...
Any advice or pointers is greatly appreciated.
Thank you!
Question by: Jennifer on Mar 31, 2016 12:52:00 AM
Great question!
Ideally an Auto Top Off controller would be able to automate your top of water instead of guessing exactly how much evaporates. For starting with kalkwasser we recommend 1/2 teaspoon per gallon of Top off water so starting you will use a maximum of 4.5 teaspoons in your 9 gallon container. If the levels are dropping after a while you can boost up to a maximum of 2 teaspoons per gallon. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Apr 4, 2016 10:47:00 AM
If I use kalkwasser and maintain my PH levels stable at 8.02 will that prevent me from over dosing Calcium or alkalinity or do I still need to monitor those peramiters?
Question by: Paul on Feb 9, 2016 11:36:00 PM
Great question!
Keeping Kalk consistent will tend to allow for not over dosing however it is still recommended to test for Calcium, Alkalinity and Magnesium to make sure that there is no precipitation or loss of the elements in the water column. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Feb 10, 2016 12:43:00 PM
I am curious, how many pounds of calcium hydroxide in the 1 gallon container? Thanks!
Question by: David on May 24, 2016 10:03:00 AM
4.5lbs
Answer by: Carter (Admin) on May 26, 2016 11:34:00 AM
I'm going to try kalkwasser for the fist time my question is if I'm going to do the drip method does it have to be directly into the display tank or can I drip it in the sump?
Question by: Miguel on Feb 24, 2016 12:25:00 AM
Great question!
You can drip the kalkwasser in any location as long as it is convenient. Many people like to dose and drip in a high flow area to prevent any precipitation. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Feb 24, 2016 3:13:00 PM
Hey there,

I've added kalkwasser to my ATO with the ratio of 1 teaspoon per gallon of ATO volume. It doesn't seem to dissolve, just settle out after a couple hours. I don't run a circulation pump in my ATO as it's only 7 gallons and I'm filling it every week. Would a circulation pump help dissolve the kalk? Would you recommend the circulation pump only coming on with the top off pump? I've read you shouldn't circulate kalk when it's in an ATO, is this true?

Thanks!
Question by: Adam on Nov 16, 2013 10:23:00 AM
Hey Adam,
You specifically do not want to circulate kalk as you will actually deplete it by doing so (your continuously adding co2 which will deplete it). Its normal to have some sediment when you mix kalk and nothing to worry about. Give it a good mix when you put it in and then just allow it to settle and use it.
Answer by: Bulk Reef Supply on Nov 16, 2013 10:23:00 AM
I've been using this product for a while now. Slowly dripping it in my sump via ATO. I get a slimy clear film on the water surface of my sump. Is this bacterial or due to low flow? Any ideas how I can get rid of it?
Question by: Marc on Apr 7, 2016 8:15:00 PM
Great question!
Film on the surface of objects often can be a diatom, waste or bacteria growth and occurs on many sumps with good flow with regular cleaning a good idea to remove the film. If there is film on the surface of the water it would be related to low flow in the sump. To eliminate the film you can try changing the flow with a powerhead to agitate the surface additionally if the kalkwasser is not dripping into a high flow area it may have some precipitation. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Apr 7, 2016 9:56:00 PM
I'm currently using the BRS 2 parts manually dosing 12mL twice a day. I have a 55 gallon with 10 gallon sump with medium stock tank with sps and lps. I can barely maintain my alk. If I start using kalkwasser with my top off water (I lose about 1/2 gallon a day), do I still need the 2 parts to maintain the alk level.
Question by: Kelvin on May 7, 2015 3:01:00 PM
No answers yet. Be the first to answer the question!
Do you offer a dosing product for Kalkwasser? Can I just add it to my RODI reservoir which feeds the auto top off tank?
Question by: Mark Steffen on Aug 7, 2016 12:44:00 AM
Hey there! We offer a few products for Kalk stirring and dosing, however the most common method is mixing Kalkwasser in your ATO container! :-)
Answer by: Randy (Admin) on Aug 9, 2016 9:51:00 PM
In reading some questions asked and answered, I came across one about using a circulation pump to dissolve the Kalk. The answer was not to, but could you at least use it initially to dissolve the kalk? Just when you add it in the beginning to mix it up. If not, then how would you mix it in a 20 gallon brute trash can?
Question by: David on Apr 29, 2014 10:56:00 PM
Hey David,
If you really wanted to you could run it for like a minute, but just pouring the kalk in and mixing it for a minute or two by hand generally suffices as well. The thing you don't want to do is continue to agitate it after the initial mixing. If for example you put the power-head in for as little as a half hour you may remove a significant amount of the kalks usefulness.
Answer by: Bulk Reef Supply on Apr 29, 2014 10:56:00 PM
Hi,
My Question is if you can't put a power-head in to mix the solution because you might remove a significant amount of the kalks usefulness, then what happens when you drip the solution into your tank? With so much circulation/water movement, wouldn't that just deplete it within a few minutes?

Thank you.
Question by: Tim on Jun 15, 2014 5:29:00 PM
Hi Tim,
The water chemistry in a container of a kalkwasser solution is extremely different from the water chemistry of an aquarium. In the aquarium the concentration is much lower and precipitation far less of an issue (though if you add to much kalkwasser to the aquarium and increase the concentrations too high it will precipitate just as it would in the storage container). Used correctly though that will not be a problem.
Answer by: Bulk Reef Supply on Jun 15, 2014 5:29:00 PM
how do i know how much to put in my ATO reservior? is there a calculator like the ones for calcium and alkalinity on BRS?
Question by: chen yang on Nov 27, 2013 9:16:00 AM
Kalk can't be added to raise your calcium and alkalinity like you would with two part because the pH swing would be so significant (hence no calculator option). When it comes to kalk you can add up to 2 teaspoons per gallon of top off water but I would start with 1/2 teaspoon. If that isn't enough to keep up with your consumption then you can go ahead and kick it up a notch until you find that sweet spot.
Answer by: Bulk Reef Supply on Nov 27, 2013 9:16:00 AM

Full Details

Kalkwasser - This will be used for daily dosing to maintain calcium and alkalinity levels as well as elevate the tanks pH.  Because this product does elevate the pH, it is important to dose slowly in small amounts.  This product is designed to be used daily to continually replace calcium and alkalinity as it is consumed and not to make large adjustments.

 

Calcium Chloride - This is used to make larger adjustments to calcium levels. This product has no effect on the tank's pH so it is possible to make larger changes to calcium levels in single doses.

 

Sodium Bicarbonate - This is used to make larger adjustments to the tank's alkalinity levels. Sodium bicarbonate does have a small temporary lowering effect on the tank's pH. It is possible to make relatively large adjustments to the tank's alkalinity without a major impact on the tank's pH but it is wise to monitor the tank's pH while dosing.

 

Magnesium Mix - Dosed occasionally to maintain magnesium levels. Maintaining correct magnesium levels helps prevent calcium and alkalinity from precipitating and makes maintaining correct parameters much easier.

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  • Cheap and easy By Eric on 9/26/2016

    A cheap and easy way to keep my calcium and alkalinity where I want it using my ATO.
  • It's Kalk -- It works! By Rakie on 8/19/2016

    Like all BRS products it's a solid choice which isn't overpriced and works great. I'm running a small tank with frags only at the moment so I'm running 1 TSP per gallon and tuning exactly how much to put into my ATO -- So far, 1 TSP seems just fine.
  • Great Product By Rich on 4/29/2016

    I've had a small 24 gallon reef nano aquarium for years with varying success. Keeping PH above 8.0 was impossible. No sooner would I get it there and the next day it would be 7.6 or 7.8. Adding supplements was just a temporary solution. Alk was always 12 or higher. Calcium was ok, but with supplements.
    I happened to see Ryan's video on kalk and using a dripper system and I thought I would give it a try. I bought a 5 gallon aquarium (the only size that would fit in my stand) and made a sump out of it with several baffles, just like the big boys do. Adding an overflow box with a drain and pump to push the water back into the main aquarium made it work. I drip Kalk into the sump using a container that holds over a gallon of water. Not only does this help with evaporation but PH is now a steady 8.2, Alk is at 10 and calcium at 420.
    In the two weeks I've been using this, my corals have opened dramatically and I can see growth.
    I wish I had done this years ago. Thanks Ryan for posting all those videos.
  • Easy, Cheap, Effective By ryan on 3/14/2016

    Works great, lasts a long time. Easy to add. This is for those who want simple, easy to maintain reef environment.
    Next additive, mag.
  • good to use By troy on 3/9/2016

    make sure ur testing u can reck stuff if u dont test and try this
  • Very big bucket By Robert on 3/9/2016

    It's much bigger than I thought and it's going to last me forever.
  • Great By Hans24hrs on 3/5/2016

    I have been using this for a while and my corals love it
  • BRS Kalkwasser is the cheapest on the market. By Mathias on 3/4/2016

    Thanks BRS. Your Kalkwasser mix is the cheapest. It keeps my pH right at 8.4. Thank you for providing everything needed for a great reef tank at the lowest prices.
  • good stuff By butch on 2/15/2016

    first time i can control my ph/watch using it in your top off one malfunction and your screwed /it happened to me i like the drip it leaves me in control
  • good stuff By butch on 2/15/2016

    first time i can control my ph/watch using it in your top off one malfunction and your screwed /it happened to me i like the drip it leaves me in control
  • Highest quality product on market! By ReefingFredsree on 1/24/2016

    I just started to use Kalkwasser recently to help me manage the pH of my 40 gallon Innovative Marine Nuvo. Despite dosing 2 part and magnesium with BRS
    dosers my pH has been running lower than I would like. I decided to add Kalkwasser to my ATO and started with Seachem Kalk which cost more than BRS Kalk and is obviously much lower quality because even when I added only 1/2 tsp to 3 gallons of 0 TDS RODI water I made myself with the 150 gpd BRS RODI system (love it and actually makes 180 gpd with the pressure booster) a lot of it didn't go into solution. With BRS Kalk this isn't a problem at all!!! BRS Kalk must be much purer. Thanks BRS for another awesome product at a very reasonable price!!
  • Kalkwasser is my friend By dcullen2 on 10/12/2015

    Great product to add to any ato setup.It will help stabilize Alkalinity and calcium levels once desired parameters are reached.