New to RODI

[hillegom]

Very unusual not to have a restrictor, it creates the proper backpressure so water gets fed through the membrane. I wonder if it already comes with one installed. Some restrictors are inside of the quarter inch black poly tube. It should be right at the connection where the black tube comes out of the ro membrane canister. It will look like this:
http://www.marinedepot.com/Flow_Rest...RORAFR-vi.html
And is pushed into the black tube so only the shoulder is sticking out. Mine is coloured black and its hard to see unless youknow its there.

[gregzz4]

It was definately missing. I checked all the packaging and the white tubing that came with this unit.
I just got back from J&L and there is now a 100gpd in the black line leaving the RO membrane.
I'll report back once I do some more math.
And once again, Thanks hillegom, you may have solved another issue for me
Down the road I'll change over to the inline style when I go with a 75GPD membrane. I've heard the 75s are more efficient.

[Buckeye Field Supply]

A 75 gpd membrane with a proper flow restrictor will still produce apx. 4 parts waste water to 1 part purified water, so it's no more "efficient" in this regard.

What a 75 will do much better however, is clean the water. Here are some spec's for you (the 24 - 100 gpd membranes are Filmtec brand):



Russ

[gregzz4]

Thanks for that Russ. I don't believe Vertex's claims of 98% rejection on the 100gpd I bought, but with 8ppm in and 0ppm out, guess it doesn't matter anyway. Makes me wonder if I'll ever need the DI.

[mike31154]

On the other side of the coin, if your source TDS is consistently that low, you could simply run it straight through DI only, ditch the RO membrane altogether. Water production may be a lot quicker in that case, although not sure if contact time going thru DI is a factor, probably is. Don't necessarily recommend you do this, but I always like to look at things from a different angle. With an oversized cartridge full of DI media, or even a number of standard DI cartridges in series, you could probably get a good amount of 0 TDS water for your tank before the DI is depleted.

[gregzz4]

Thanks for the thoughts Mike, but we'd like to drink the water too

[hillegom]

T off before the DI for drinking. Tastes better.