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i have a brs water saver rodi. it usese 2 membranes. the waste from the first goes through the second membrane, i get about 2:1 waste to product and 0 tds final product. the reason i got it is im on well water and didnt want my well pump circulating on and off too often.
i do use a booster. have to with a well as pressure fluctuates with cycling.That's a fine use for it, but folks should recognize the trade off. You do not get something for nothing by adding a second membrane. The rejection rate for each membrane is poorer than one alone and hence the DI depletes faster, unless you use a booster pump to deal with the the pressure drops across the membrane.
But, he's in California and, despite the recent record rainfall, drought-awareness is a real thing there. I appreciate the OPs interest in conserving water if possiblelol. Take a look at your water bill. My bill probably about 60 or so month. I’m usually 6 to 8 bucks in water cost itself. The rest is crap fees and charges!
I mean he’ll, I pay for my water then I pay to have it recycled for some other idiot to pay for to use! lol.
Is he doing it to conserve water or to save money? If it’s to conserve water I commend him (even if it’s a oz of water conserved) but if it’s for money then he’s wasting it.But, he's in California and, despite the recent record rainfall, drought-awareness is a real thing there. I appreciate the OPs interest in conserving water if possible
Contrary to what a major vendor in this space suggests, in most cases this is not a good idea. Would never recommend it for the OP with incoming TDS at 400+ as almost certainly he has high hardness. Why?As mentioned above, if you want to conserve water you can run a double membrane setup. This is what I do. BRS has double membrane upgrade kits for their RODI setups.