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Old 01-11-2005, 01:07 PM   #11
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You put the waste water and the RO/DI in the same container? This will take the benefits of having RO/DI water away. You can use the waste water for clothes or maybe watering plants but you don't want it in the fish tank. Might as well use tap.

If I misunderstood what you are doing, sorry
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Old 01-11-2005, 01:16 PM   #12
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You are most of the way there....I tested the "waste" water for nitrates since that was my problem with tap water. It came out at 0..it was suggested earlier that before I start saving this water for tanks that I test it for PO4 as well...I did that and came back with a .25 or better reading. My quandry was that I am watching this water run down the drain but it's been through 4 stages of RO...and it's lacks the nitrates that I wanted to get rid of anyway. What's the harm in using water that has been through all but a DI and polishing stage?
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Old 01-11-2005, 01:18 PM   #13
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Quote:
If I misunderstood what you are doing, sorry
I think you misunderstood, as I did when I read it.

I was thinking the same thing... Why have an RO/DI if your going to mix the waste water with the "pure".

He is testing to see something. He said his 4th stage was the RO membrane. He wanted to see if the DI/Polishing stages (5 and 6) are doing anything positive for the water.
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Old 01-11-2005, 01:20 PM   #14
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The21Kid: Whats your TDS after stage only stage 4?
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Old 01-11-2005, 01:21 PM   #15
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I am sure that if I use a TDS before and after the DI stage I will get a lower reading. But my tap water quality is only high in nitrates from my tests. It doesn't contain a high amount of other pollutants that may be present in other enthusiats tap water. So I figured I would save a quid or 2 but not having 75% of my input water go down ye ol' drain....just wanted to see if anyone (good to see some) other people had thoughts or maybe considered this
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Old 01-11-2005, 01:22 PM   #16
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Aspec...I sit here embarrased cause I don't own a TDS yet...working on getting one to run that.
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Old 01-11-2005, 01:48 PM   #17
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I guess if the TDS was low enough, it could be used but for most, a RO/DI unit is used to get pure water for the tank. You are filtering it and then mixing it with the waste. I guess it might be cleaner than what you started with ... never tested that myself.

With a PO4 of .25, you will have algae issues at some point. The DI filter will remove this but you add it back by adding the waste. Unfortunately, with the RO/DI, you waste water. There has been more than one thread on that matter alone.

Try it and see what happens. I used tap water for years on a FO tank with no problems. I moved and upgraded to a bigger tank and went to a reef setup and then had red slime algae like crazy. The RO/DI fixed this.

Good Luck
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Old 01-11-2005, 01:51 PM   #18
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TDS is on the way....when Paypal gets it sh*t straight today. Thanks for all the advice...I will keep you informed. I have an artificial set up so the total purity of my water is not as important as you reef and LR keepers. I will keep an eye out for the algae issue.
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