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There is no direct answer as this will vary on your source water. Using a TDS meter you can tell when the water coming out of your unit has increase and we tend to recommend changing all of the bottom filters when the TDS is above 0 and the RO membrane once every 2 years or so depending on the TDS on the In stage.
Assuming your DI cartridge is refillable, this is the kit you're looking for: http://www.bulkreefsupply.com/brs-4-stage-value-replacement-filter-kit.html
When it comes to the membrane that is a bit trickier. Your system likely has a restrictor set for 90 GPD, but in my opinion I might recommend a 75 GPD membrane and a new restrictor. The 75 GPD membrane offers a 99% rejection rate, but will produce less water in 24 hours. The closest thing we would have to an outright replacement would be our 100 GPD membrane:
I have included a link tot he 5 stage universal kit (which will replace all the bottom filters) and another link to the RO membrane which will need to be changed once every 203 years typically. Feel free to let us know if you have any further questions!
The 5 stage Value Replacement Filter Kit has been upgraded with the latest in carbon block technology and the best five stage RO/DI solution to universally treat for chloramines, chlorine and well water. The kit includes the upgraded GE 1 micron ROSave.Z true graded density depth sediment filter, two new 1 Micron BRS Universal Carbon Block and a BRS Color Changing DI Refill. This kit can be used with legacy 5 Stage BRS RO/DI systems and all major competitor 5 stage RO/DI systems that use standard 10” filters.
Recommended installation for this package:
- Stage one: GE ROsaves.Z 1 Micron Sediment Filter
- Stage two: BRS Universal 1 Micron Carbon Block
- Stage three: BRS Universal 1 Micron Carbon Block
- Last stage: DI Resin
BRS Universal Carbon Blocks are manufactured using high performance catalytic active carbon combined with a new binder system technology which maximizes the availability of the critical catalytic sites. The combination of advanced carbon technology, increased volume of carbon contained in each filter and proprietary manufacturing processes delivers exceptionally high chloramine, chlorine, VOC and general chemical performance.
- NSF Certified
- Specifically formulated for superior Chloramine reduction
- 1 µm (micron) Nominal Filtration*
- Chlorine 35,000 @ 1 GPM**
- Chloramines 3,500 @ 0.5 GPM***
- High chemical adsorption
- 30% more carbon than standard blocks****
ROsave.Z Depth Filters are made in the USA and specifically made for reverse osmosis pretreatment applications. This premium sediment filter will protect the more exspensive carbon blocks and prolong over all filter set life to decrease over
ROSave.Zs' Z.Plex technology provides great performance:
- Up to twice the life of conventional depth filters
- Up to 50% lower pressure drop
- Up to 100% greater dirt holding capacity
- Superior SDI reduction
- Melt-bonded exterior ensures no media migration
- Provides lower total cost of filtration operations
- NSF 42 certified, FDA compliant
BRS Color Changing Resin is packaged in foil-lined 4mm Mylar bags and vacuum sealed to maintain maximum storage life and effectiveness.
- Changes color from blue to brown as the media is exhausted.
- 2 year shelf life (unopened)
- Total cation capacity: 1.9 meq/mL min (Na+ form)
- Total anion capacity: 1.25 meg/mL min (cl+ form)
*Nominal Micron rating for all above - 1 micron
**2ppm free chlorine >90% reduction
***3ppm monochloramine >85% reduction
****Manufacturer's internal test data
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Fast shaping, clean product By Techbiker on 8/21/2016Techbiker wouldn't recommend this product to a friendIs not much to review on this since I have been using it for a while, but the consistency of the quality trough the years I give them a 10 on their products
Not my first rodeo By Jason on 6/26/2016Jason would recommend this product to a friendWill be buying this kit again when the time is near. Easy installation and clean water.
A+ Kit By Michael on 6/6/2016Michael would recommend this product to a friendPurchased this for my BRS RODI system. Very easy to install and everything is pre-portioned and ready to go. I plan to buy this once a year no matter what to ensure that my tank is getting the absolutely best water I can give it!
Great Value By June on 4/19/2016June would recommend this product to a friendThanks BRS for packaging up everything we need for our RO. We buy the DI resin in bulk form you, but this little extra always helps. :)
Keepin it real By Tbone on 2/13/2016Tbone would recommend this product to a friendEvery year, even if I don't need it, I change everything, doesn't cost much and that's one thing I don't worry about, great products, and prices!!
Great product By serenaf63 on 2/10/2016serenaf63 would recommend this product to a friendbest replacement and easy to install, I've always use these products for a happy aquarium!
Great stuff By troy on 1/28/2016troy would recommend this product to a friendGreat products but kinda upset I didn't realize how fast I would burn through di I didn't think about flushing it befor so my 5tds turned into 150 during turn on :/
Works! By Rugid on 1/27/2016Rugid would recommend this product to a friendWorks awsome. Shipping was fast. Best filters on the market. Resin lasted twice as long as estimated.
Best replacement!!! By Fabio on 12/18/2015Fabio would recommend this product to a friendClean water for longer than I expected.
excellent product By Richard on 8/17/2015Richard would recommend this product to a friendEverything arrived as promised. Installation was a breeze. Took about 10 minutes, start to finish.
it works like it should By paul on 7/24/2015paul would recommend this product to a friendit works well
As simple as it gets! By Mark on 6/5/2015Mark would recommend this product to a friendIf you want to maintain the quality of your RO/DI system, this is the best replacement set for the money.