Quote Originally Posted by doco
I may look at what dosage levels I should use H202 at, which I have never used before. If anyone uses it, gimme a shout.
I use 50% (horticultural grade) H2O2 at 1ml/litre every 3-4 days as an antimicrobial. Plants will tolerate 10x that concentration with no ill effect.

If you have an acute pathogen problem in a tank, do a one time dose at 5ml/litre then return to 1ml/L per 3-4 days.

Pharmacy grades at 3% & 6% can also be used, but it gets expensive if your tanks are large. Apply 3% @ 17ml/L and 6% at 8ml/L.

H2O2 can't be used with organics; it will break them down on contact.
Al B. Fuct Reviewed by Al B. Fuct on . Nutrient Strength pH Balance Relationship? I just saw this on another site and since I hadn't heard this before, wanted to run it by some of you - whatcha think? "There are a couple factors that cause your PH to drift. The most common is running the nute solution too strong or too weak. If it's too strong, your PH drops. If it's too weak the PH rises. You have to find the balance point." Rating: 5