Let's say I add 5 to 10 gallons of RODI water to a water change?

reef12

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Would I have to add anything to the water, or would say the other 25 gallons even all the 10 gallons of RODI water out.

I want to add 10 gallons of RODI water to my change water, maybe to lower the DH KH of the water sound good?

Thanks

Jeff
 

fablau

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Let's say I add 5 to 10 gallons of RODI water to a water change?

What's the tank size? What's your tap KH? I have a pretty high KH of 7, and unless I have 50% RO and 50% tap I can't see my KH lower enough. That's why I just avoid using RO, too much work and no really big results (I tried to use RO for 3 months the last summer, then got back to regular tap)
 
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Tom Barr

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Cutting say a GH/KH of 8 down to 4 with 50/50 tap/RO works well, or 1/3rd whatever you find works well.

No need to add extra to it in most cases, but check the Ca and Mg from the tap water company.
 

Tom Barr

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Cutting say a GH/KH of 8 down to 4 with 50/50 tap/RO works well, or 1/3rd whatever you find works well.

No need to add extra to it in most cases, but check the Ca and Mg from the tap water company.
 

reef12

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Thanks both , might just say hell with it.

Tank size 125, but might use it on the 75, I see that I can get RODI at Walmart Food store place $.38 cents a gallon so $3.80 for 10 gallons plus the bottle price of $6.00 so another $12.00 , so I won't have to hook up my RODI unit , as the wife does not want me too.:moody: