zandor no rock wool for you.... still my heart.... I have this friend.. he reminds me of you... here comes the punch line....

he is such a perfectionist that he bleaches his lava rocks every 6 months.. BLEACHES them.... what the f%$k!!!!

lol - and he hates the algea on rockwool drives him f-ing bonkers....

you da man... : )

yeah... I think you are right... 10ml per gallon - 3% hydrogen peroxide.. the over the counter stuff that cost about .99 cents a bottle...

You can add H peroxide every 3 days with out worry into a functioning resivoir in 75+ degree rooms.

One more thing... you can test this out... if you put an air stone directly under a plant in a hydro/aeroponic system... come harvest time its roots will be at least 5 times bigger than it's peers..... plants love air stones