well this thread shows what a bunch of stoners we all are, if you wanted 2 ml per gallon and you added 40ml to 25 gallons you are still 10 ml of bleach short lol. now i don't know anything about using bleach for this purpose, but i know maths when i bother lol. so if the recepy calls for 2 ml bleach per gallon you can add 10 ml more to that 25 gallons of water
sorry for not paying more careful attention.
I added 10ml per gal to knock back algae growth, the main source of problems in my system(it cuts loose and blocks tubing, or at least it did).
The algae that was growing in my res and tubing. I guess breaks loose would have been a little better wording for it.