Ro/Di unit

m.miller1547

Active member
Okay so I've never purchased one. Im looking for advice on what I need. I plan to plumb it under my kitchen sink. What's the tds meter for? I have a tiny setup. I need one that is low gpd.
 
Pricing doesn't really change much between different gpd rated membranes between 25-90 gpd, it's the total stages of filtration and extras that make the most difference in price. A TDS meter will show you what your total dissolved solids are in the water, most useful in seeing when your DI resin is spent and needs changing. A flush kit will rinse the membrane extending its life, and a pressure gauge will let you know if your rodi is running on optimum pressure range. Otherwise, you want at least one sediment filter, one carbon block, an RO membrane, and a single DI filter to make water for your reef tank. The BRS 5 stage plus is just about your best bang for the buck if you are buying new. You get all the extras and it ships free. You might get a better deal at spectrapure on a similar setup, but then they charge shipping and you spend more.
 
I have a BRS unit too and I do like it. There are units on eBay that are pretty cheap. The filters used in RODI units are pretty universal.
 
Here are some things to look for in a good system for this hobby:

-No more than 4 stages (sediment, carbon, RO, DI) unless you have specific water quality issues you want to address
-Standard-sized prefilters, membrane, and DI cartridge
-Brand name, high-rejection membrane
-Specifications provided for each stage
-Pressure gauge after the prefilters and before the membrane
-Thermometer
-TDS meter (handheld or in-line)
-DI bypass
-Vertical DI stage
-Refillable DI cartridge
-Aluminum bracket
-Quick connect fittings
-No water from pressurized storage container delivered to DI
-Flush valve
-Clear housings
-High-quality instructions written in clear English
-Customer support before, during, and after your purchase
-A vendor involved in your hobby

Russ
 
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