Quote:
Originally Posted by mike31154
It's still a DOW membrane.
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Actualy there are about 5 major membrane manufactures and a few smaller ones, Dow was the standard, could be still, I haven't looked at specks laitly, but most of the RO's we buy don't come with DOW as they are more expensive. actualy there are a lot more than 5 now, just looked it up, here is a company that sells a tone of different brands
http://espwaterproducts.com/resident...-membranes.htm
most companies will buy a generic 60/100 membrane and sell there unit as a 100gpd. well this system will put out 100 gal per day but only at 90 PSI water pressure and the right temp, at the test rate of 60 psi it is only a 60 gpd membrane. always but the membrane that will give you your desired output at 60 psi, unless you have a booster pump.
my RO came with two membranes, they were hydrotec 50gpd membraines, when they were done I replaced them with 100/160 membranes and bought a booster pump that would give me 120 PSI feed psi. I ended up getting 300 GPD out of this set up with cold water, there is a lot you can do just decide what you want and get the right parts. you can also use a flow valve as a restrictor, just takes a bit to set it up but it is more fine tunable, I used to set my system at 3.5/1 rejection rate.
Steve
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