RO waste water

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Waverz

Candiru
MFK Member
Apr 28, 2006
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iowa
Hey gang, been a long time since I posted here. I used to keep a few varieties of rays years ago and have gone to Reef since then. I did however keep a 75 gallon with tanganyikans going and actually have some Compressiceps that are big enough to spawn, it only took 5 years.

Anyway, I have been doing a lot of water changes on my reef tank lately and noticed I am pumping tons of water down the drain being my RO unit rejects 4 gallons of water for every gallon of RO. I decided I would try to utilize this water by letting in run into my 75 gallon cichlid tank and the overflow from that would run tot he drain. Is this safe? I am thinking it should be as it goes through 2 sediment filters and 2 carbon filters before it is rejected by the RO membrane. In theory the carbon blocks should be removing all chloramines so it should be safer than tap water although it may just be higher in TDS.

What do you guys think?
 
RO water usually have low KH and GH... usaully with a value of 1. having said that its pH is usually at 7-7.5. now since you have chiclids on your 75 gal i guess the ro water wont fit them since they prefer hard water... also you my have a problem with the buffering capacity of the RO water... try to test the water first....
 
djoverdose;3324462; said:
RO water usually have low KH and GH... usaully with a value of 1. having said that its pH is usually at 7-7.5. now since you have chiclids on your 75 gal i guess the ro water wont fit them since they prefer hard water... also you my have a problem with the buffering capacity of the RO water... try to test the water first....


I am using the WASTE water from my RO/DI unit not the actual RO water itself, I use that for drinking and my 300 gallon reef system.
 
Yeah don't do that.

Ro/DI waste water wouldn't be acceptable unless you diluted it with a similar amount of water that you removed.

Think on it this way. If your RO/DI system tosses 4 for every 1 processed, that means the 4 waste gallons are now 20% more concentrated than prior.

So you could do it if your tap water was low on hardness and other nutrients, but make sure you do out the math before you actually accomplish the task.
 
I should also mention the water going to the RO filter has gone through a softener first, that would make quite a difference I'd imagine.
 
test the wast water and if its within your "acceptable" range then go for it.. if not then.. well.. thats what the lawn is for..
 
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