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Old 07-26-2009, 07:08 PM   #1
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Is my RO/DI filter shot?

I made a batch of fresh water this morning to get ready for a PWC for my 29g bio-cube tomorrow. I tested the water with my hand held TDS meter and it blinked 999, meaning there was a bunch of crap in the water. I tested the water out of the tap and it read 147. I then took a small sample of the water directly from the RO/DI unit and it read 18. Could the container that I'm using be leaching chemicals into the water? there's a brown slime in the container also. I have no idea what it is though. The container is in the basement with no top. Would water in the RO/Di unit go bad if it isn't flowing through the unit? The DI unit looks good, i.e it isn't completely depleted. it's only changed color about 1-2 inches from the bottom. Could the "brown slime" be DI resin? Is Di resin friable? What gives? I'll buy some ready made water tomorrow after work for the PWC.
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Old 07-26-2009, 07:53 PM   #2
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if your not testing zero its time to change the filters.
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Old 07-26-2009, 08:28 PM   #3
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that really really sucks big time! I've only had it for several months. I'll change out the filters but I think I should've gotten more use out of them. Any idea what the "brown slime" could be?
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Old 07-26-2009, 08:41 PM   #4
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Are you treating the RO/DI with a de-chlor?
Do you have water movement in the mixing bucket?
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Old 07-26-2009, 10:00 PM   #5
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I have a carbon filter in the RO/DI unit. I'm not using any additives after the water is made. For water movement in the 35g plastic bin I'm using a moded maxi-jet 1200 with the Ecodrive unit. I retested my RO water again. I got a 0 reading using a clean cup(plastic) and high 600's if I took the water out of the tub. For some reason the brown slime is causing my TDS meter to go high(i don't know what the slime is)or the plastic bin is leaching chemicals into the water. Either way I ordered new resin, an in-line TDS meter, and I'm getting a food safe bin for the next PWC.
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Old 07-26-2009, 11:02 PM   #6
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Make a small batch of RO/DI water into a clean container and retest with a TDS meter.
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Old 07-26-2009, 11:04 PM   #7
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Do you let your filter chambers go dry between use? I read that is not good for the filter media.
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Old 07-26-2009, 11:08 PM   #8
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No. My filter media is always submerged. I would like to know something, I have an ASOV installed in the tub. When it shuts the water going into the tub should it also shut the drain water?
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Old 07-30-2009, 01:29 PM   #9
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Is it a special ASOV? Most of them (I thought) were really only useful if you were filling into a sealed tank. The engineering being that when the line pressure gets close to the tank pressure it shuts off.

Not sure on the water shutoff. I don't run mine into a holding tank.

Have you back flushed recently?
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Old 07-30-2009, 01:53 PM   #10
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I meant the ASOV is on my RO unit, sorry for any confusion. I have a float valve in the tub but when the float valve shuts the water going into the tub water continues to come out of the drain. I haven't back flushed it. should i?
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