rolanddiver

I don't know anything about Biox, I use isopropyl alcohol as second last flush, that removes all the hydrocarbon leftovers. After that I won't let the alcohol evaporate on its on, simply because it leaves its usual odor in the tank. What i do is that I put the shower hose inside the tank and let hot water run thru for a few minutes. It removes all the cleaning material residue, plus significantly warms up the tank(it doesn't do any harm at all). Then I dump the water out of the tank and let it dry upside down on a stand that allows the water to come out and air to get in the tank. Also what you can do (even though it dries the tank in a matter of seconds) is to blow oxygen clean air into the tank using a clean intermediate pressure hose(any regulator hose). Some people might say that what I wrote is not good because of this or that, but it had worked and still works. I never had any problems at all. I hope it helped.

Roland