Recent content by Unresistible Blue

A word to the wise re buying huge quantities of resin. Mixed bed resin, even if stored in perfect conditions, we start to loose its capacity to do what is expected of it if stored for much over 9 months. So order in quantities you can use in a reasonable amount of time.

A little background on this subject - it seems to come up often. Manufacturers report the nominal production of their membranes under standard conditions. Filmtec membranes for instance, use the follwing standard conditions: 77 degrees F feed water 250 ppm feed water 50 psi Other manufacturer...

Steve - did you get that RO system up and running?

You should think about some replumbing of that system as well: -get rid of the horizontal DI -get rid of the GAC after the DI

The RO membrane is really the workhorse of the system. It removes most of the TDS, some membranes to a greater extent than others. For instance, 100 gpd Filmtec membranes have a rejection rate of 90% (i.e., they reject 90% of the dissolved solids in feed water). So the purified water coming from...

I'd avoid the hot water appraoch - just grab the neck of the RO membrane with a pair of pliers, and twist while you pull.

I recommend a catalytic GAC stage prior to the carbon block to treat chloramines

If you were using the unit in a lab, you might flush it each time you turned it off. No one in this hobby does that, so once a week is better than once a month is better than once a year. B

or your membrane is damaged, or your water pressure and or temp are to low to force water through the membrane

A good rule of thumb is to replace your sediment filter and carbon block after six months. A more precise way to maximize the useable life of these two filters is to use a pressure gauge to identify when pressure reaching the membrane starts to decline. This is your indication one or both of the...

This happens when you're not warming up your RO source water. Cold water is not as viscous and will not penetrate the RO membrane well. Hmm... water becomes more viscous as it gets colder... Trouble with ASO valves can often be traced back to a leaking float valve, or a bad check valve...

Ben - not sure if you ever really got an answer to your questions. A water pressure of only 36 psi will adversely affect your system performance without a doubt. For instance, if you have a 50 gpd Fimtec membrane, at 36 psi the best you could hope for is approximately 35 gpd. Its likely you...

1. Your timing indicates a 4:1 ratio - you're in good shape here. 2. While the unit is running unscrew the vertical DI housing about a 1/4 turn to allow the trapped air to escape. Watch carefully as the water in the housing rises - when it approaches the black rubber oring cinch it closed. 3...

I think you mean DI resin OR an RO membrane.

In some cases, yes. There are systems being sold out there for instance that have a GAC stage after the DI. Hmm... Think about that one for a minute. Some systems have two vertical GAC stages and a small horizontal DI - We work with lots of folks to replumb those systems to go with a single...