GFO and KH on a 20 gallon tank


New member
so i was using the recomended dosage for phosban and it was dropping my KH and CA levels very fast while dripping limewater.

the directions say to use a minimum. How many tbls would you use?
it says 1 gram/gallon for heavy phospahte.
I just picked up another bottle, but of rowaphos---there were out of phosban.

How much can i use without screwing with my KH and CA level in a 20gallon tank with phosphate problems.


Premium Member
Oops, this seems to have gotten overlooked. If you're still having the problem, I'd suggest making sure the lime drip isn't very close to the GFO reactor input.


New member
Thanks bertoni,

I was going to let it slide :)

The drip is on the other side of the tank. I only used 3 teaspoons of material but I don't think it will last for more than a few days.

I've read the articles about reduced KH when running high amounts of GFO. But when Randy said this stuff could be exhausted in a day or so, I thought i should run more...but it just reduced my KH too much.

Has anyone found a big difference in media, I'm looking to get some from BRS.