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A "DI"rty job but someone's got to do it

Posted 09/20/2011 at 02:48 PM by Spaced Cowboy
Updated 09/21/2011 at 11:10 PM by Spaced Cowboy (update from supplier)
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So, for the last week or so, the RO/DI system has been churning out RO/DI water, I've been mixing it with salt in the mixing tank, and then storing it in the NSW tank. So far, I've got ~70 gallons of pure RO/DI water and 290 gallons of NSW water ready to go. That's a total of ~360 gallons, and my RO/DI meter started to say it was reading 1ppm on the output.

Now this is a dual-stage DI-resin system, so there are two, not one, media chambers full of DI resin. I'm thinking that ~360 gallons of purified water is a little low for this system. The input water pressure is ~70psi, and the PPM readings out of the RO side (before DI) are ~20ppm, which seems to be a bit high compared to what others are seeing. I'll be contacting BRS to see if there's anything they can do...

Hopefully BRS will come up with a reason why it's not working as well as it ought to, and I won't be changing resin every couple of months...In any event, I've changed the resin - now that it's registering 1ppm it's done, as far as I'm concerned. You can see the difference between the before/after below...

[CENTER][IMG]http://www.0x0000ff.com/imgs/fishtank/di-beforechange.jpg[/IMG] [IMG]http://www.0x0000ff.com/imgs/fishtank/di-afterchange.jpg[/IMG][/CENTER]

Note: I do like the refillable canisters that BRS use. It took about 10 minutes to change out both canisters this lunchtime and fill with new resin.

[B][U]update: 21st September[/U][/B]

So BRS got back to me in their usual efficient fashion, and it seems it may just be my water. As and when I can get the water tests done, I'll follow up, but apparently I was expecting a little too much from the dual-DI canister setup that I have. Oh well. It means that I might be buying resin more often than most folks, but it might also explain why the water-purifier filter in the fridge does such a good job on the tap-water around here. Yay! San Jose!
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