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Old 02-22-2008, 11:38 PM   #51
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I was surprised to find them that high but I am also wondering about the wide ranges I was getting. I've never looked at nitrates before and have no idea as to their variability. I know, especially in agricultural area, seasonal variations can be large. Other kits are en route.

I am looking at some DI units right now. Can they be run 'on demand' or do they need a constant flow? The big ones I work around can just sit or whatever, as long as there is no biological activity. You just regenerate with caustic/sulfuric as needed.


I am going to construct an auto-leveler. How long can DI water sit in a bucket before it gets bug ridden or whatever?
DI units (without the RO) don't need constant flow and you can use them as an "on demand" system. You're right about the biological activity though. But as long as you trickle something out once a day, you're probably OK. As long as it's not a mixed bed, and your have separate cation/anion resins you can regenerate it.

I wouldn't go and store up a month's worth of top off in the auto-lever, but if you stuck with a week's worth and kept it covered, you should be OK, I'd think. Maybe others that use them will chime in.
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Old 02-23-2008, 01:06 AM   #52
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This actually isn't a bad idea, non-aquarium-wise. I need DI on occasion around the house and this is nicely convenient. Looks like I can get 3 GPH for just a little over $100 or so.
Yeah most RO/DI units have a spigot to dispense just RO water for drinking water before it hits the DI stage that you would use for your tank. Definately better to drink that than your tap water. I just drink water from my refridgerator it has a filter not that great I am sure but better than the faucet. Why it is better to drink RO water verses RO/DI water I am unsure of maybe to save the life of the DI cartridge or to not overpurify your drinking water
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Old 02-23-2008, 01:08 AM   #53
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I wouldn't go and store up a month's worth of top off in the auto-lever, but if you stuck with a week's worth and kept it covered, you should be OK, I'd think. Maybe others that use them will chime in.
I usually produce about 20 gallons of RO/DI water and store in my trashcan with a lid. It is usually about 2 PWC so it doesn't sit for long.
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Old 02-23-2008, 02:09 PM   #54
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I have a 45 gallon BRUTE (food grade) container for my top off water. I fill it every 3-4 weeks. I keep it tightly covered and cut a hole for the one hose coming out to the tank from the ph that sits on the bottom. I empty the tank and wipe it out quarterly as it not a perfect seal. US Plastics sells food grade containers in various sizes that would be better sealed and suited for longer term storage.
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Old 02-23-2008, 04:20 PM   #55
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I have a 45 gallon BRUTE (food grade) container for my top off water. I fill it every 3-4 weeks. I keep it tightly covered and cut a hole for the one hose coming out to the tank from the ph that sits on the bottom. I empty the tank and wipe it out quarterly as it not a perfect seal. US Plastics sells food grade containers in various sizes that would be better sealed and suited for longer term storage.
They are also sold at local Restaurant supply stores. We have 1 locally called Bargreens the shipping on a garbabe can could be spendy.
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