- Pharma Kalkwasser (Calcium Hydroxide) - Bulk Reef Supply
Ultra-pure Kalkwasser for Reef Tanks!
BRS Pharma Kalkwasser is not your typical calcium hydroxide. It is made from an ultra-pure source that contains extremely low amounts of aluminum and compared to traditional kalkwasser you can actually see the difference. If you are adding Kalk to your ATO reservoir or a reactor, you will find that BRS Pharma Kalkwasser mixes faster with fewer impurities, and is more even potent than the others meaning you will not have to use as much, saving you money in the long run.
Two Sizes Available:
- 2 Pounds
- 4 Pounds
Using Kalkwasser (Calcium Hydroxide)
Kalkwasser is the easiest method to maintain calcium and alkalinity levels in a reef aquarium not to mention low cost. With a few different methods to implement it, if your corals are growing and you need to add calcium and alkalinity, you will more than likely find multiple benefits from using kalkwasser. Being the only way to add calcium and alkalinity from a single solution along with helping elevate the pH of your aquarium to helping purify your ATO water even further, there are plenty of reasons to add kalkwasser to your ATO reservoir or set up a Kalk reactor or drip system. By far the most common application for kalkwasser is by adding it to your tanks top off reservoir and then relying on the auto top off system to deliver small amounts of saturated kalkwasser solution throughout the day.
We suggest using BRS Calcium Chloride, BRS Sodium Bicarbonate, and BRS Magnesium for General Adjustments to elevate and balance your aquariums parameters before using Kalkwasser.
How to Use Kalkwasser with an ATO System
Step 1. Test and adjust your aquariums calcium, alkalinity, and magnesium levels using BRS Calcium Chloride, BRS Sodium Bicarbonate, and BRS Magnesium for General Adjustments.
Step 2. Start by establishing the proper amount of kalkwasser to mix into your aquariums top off water reservoir.
- Low Demand - 1/2 teaspoon per gallon of top off water
- Medium Demand - 1 teaspoon per gallon of top off water
- High Demand - 1 1/2 teaspoons per gallon of top off water
Step 3. With RODI water fill your top off reservoir & mix in the proper amount of kalkwasser then allow the solution to settle for 30 minutes before using.
DO NOT OVERMIX: Excess mixing and air contact will decrease the potency of kalkwasser.
Step 4. Place your ATO systems pump or intake line is place 1/2" to 1" above the base of your reservoir, ensuring only the clear slurry is being dosed.
Step 5. Activate your ATO and monitor the pH of your aquarium as the kalkwasser solution is being dosed, not exceeding increases of 0.20 pH. Your ATO should be pumping water into a high flow area of your sump or display tank to help prevent precipitation. Adding kalkwasser too fast may result in precipitation rendering it ineffective.
Step 6. Monitor your aquariums calcium and alkalinity daily, adjusting the strength of the kalkwasser solution in your top off reservoir as necessary.
Note: We highly suggest using a pH controller to prevent against pH spikes and overdosing.
Refilling The Reservoir
Simply refill your container with fresh RODI water and add the proper amount of kalkwasser per gallon of new RODI water and mix. It is recommended to clean your ATO reservoir regularly, though you do not have to every time you replenish your ATO container.
Maximum Dosage - 2 teaspoons per gallon of top off water
One of the limitations of kalkwasser is its 2 tsp. per gallon saturation point. Anything more than that will simply fall to the bottom of your reservoir and become essentially useless. If your aquarium is requiring more calcium and alkalinity added than what kalkwasser can keep up with there are a few solutions;
- Start 2-part dosing
- Increase your aquariums evaporation rate with fans
- Vinegar method (experts only)
How Does Kalkwasser Work?
Kalkwasser or Calcium Hydroxide Ca(OH)2 when mixed with fresh RODI water contains a perfect balance of alkalinity and calcium ions that can be added to your aquarium to help supplement what your corals consume when they grow. It is pretty easy to see where the calcium is derived from but the alkalinity can be a little more difficult to see, and when Kalkwasser is added to your saltwater tank a simple reaction takes place converting the hydroxide into available bicarbonate ions. Essentially the CO2 in your water and atmosphere will react with the hydroxide ions creating bicarbonate ions and increasing your tank's pH, due to less available carbon dioxide.
Ca(OH)2 = Kalkwasser
OH- + CO2 = HCO3 = Bicarbonate
OH- + HCO3 = CO3-- + H20 = Carbonate + Pure Water
Kalkwasser By Rafaylina on 3/17/2018Rafaylina would recommend this product to a friendThis kalkwasser is easy to mix. Also easy to use with an ATO once you have your parameters dial in..
Works great By Jack on 1/16/2018Jack would recommend this product to a friendThis product is a great beginner way into keeping your cal and alk up with just your ato. I've been running it over a year now and my nano reef tank is doing great.
Great for any hard coral out there By Jack on 12/5/2017Jack would recommend this product to a friendI purchased the 1 gallon and it's last me about a year on my two nano tanks keeping my calcium up and my corals are growing great
This is a great product By Richard on 11/24/2017Richard would recommend this product to a friendI've been using this product in my BioCube14 Nano mixed reef for approximately 6 months now. I mix 2 teaspoons in 1 gallon of RODI water and shake well. It takes a couple of days for a very thin layer of residue to settle at the bottom of the container leaving a nice clear saturated kalkwasser solution above ready for use. I remove the clear solution from the mixing container (leaving the residue layer behind in the mixing container) and pour the clear solution directly into my make-up water reservoir. The kalkwasser is automatically dosed every time the auto top-off system does it's thing. I use an Auto Aqua Smart ATO - Micro (which has worked flawlessly for more than a year now) and I submerge the ATO pump directly in the kalkwasser-filled reservoir. After six months of operation I removed the pump to inspect and clean as required. I expected a build up of white crusty material throughout the pump but in fact it was very clean. I did little more than rinse the pump with fresh water and wipe it off before reinstalling it (I still keep a spare pump on hand just in case). Prior to using this BRS kalkwasser product my pH was consistently between 7.8 and 8.1 (measured with an electronic pH probe). Since introducing this product and dosing method my pH is consistently between 8.1 and 8.3 including during the nighttime when the pH drops toward the lower end of this range. My 'critters' are happy with the results and so am I. ONE NOTE OF CAUTION: This product is a very fine powder that easily goes airborne when being handled; even very gently handled. Protect your health by avoiding inhalation or letting it come into contact with your eyes. Happy reefing!
Works great By Dan on 9/25/2017Dan would recommend this product to a friendThis is why I shop at BRS
You can get what you need in bulk price
Meet my needs By Jkor on 5/2/2017Jkor would recommend this product to a friendI purchased this to kill coral that was growing in areas I did not want it. If I did not it was going to take over. Put some on some coral, let it settle. The coral slowly dies and this does not have a negative effect on the rest of the tank.
value By mike112 on 5/2/2017mike112 would recommend this product to a friendKalk is definitely the way to go and this is by far the best value on the net!! Thanks guys and keep up the videos! I have learned so much from you guys. You brought me back into the hobby.
Easy to use and does its job. By Doug E Fresh on 4/10/2017Doug E Fresh would recommend this product to a friendJust as the title says. Once I raised my levels to where I wanted them and a little tinkering to get dosage right it keeps my Cal and all right where I want em.
Great By Jd on 3/21/2017Jd would recommend this product to a friendGreat at maintaining my levels with my ato. Clears pretty fast
Kalkwasser By Kris on 1/24/2017Kris would recommend this product to a friendGreat stuff, good price.
I thought all kalkwasser was the same By Chas on 12/31/2016Chas would recommend this product to a friendI thought all kalkwasser was the same, but I was wrong. Usually after settling overnight there is a layer of undissolved material on the bottom of the bucket, but with this stuff there's practically nothing. Pretty impressive for a low cost option.
Cheap and easy By Eric on 9/26/2016Eric would recommend this product to a friendA cheap and easy way to keep my calcium and alkalinity where I want it using my ATO.
Starting at: $6.99