Originally Posted by Stingingfork
I ordered some of the additive that Herk had mentioned (Unique RV Digest-It) and it should be in by Friday of this week. My question is since I just winterized my water system should I wait until next spring to add to the black and grey tanks and after flushing continue with the Geo method or would you go ahead and add now and flush before the onset of winter? Also what amount of water or antifreeze do you normally leave in the tanks for the winter to help maintain the seals on the gate valves?
I don't know if the Digest It has a recommended temperature range...it probably does and it's probably too cold now.
You could do it now if it's not temperature dependent by pouring it into the toilet/shower drain and adding water with a hose in the toilet and shower drain. Where would you dump the tanks when you're done?
Best to leave the tank drained as much as possible...no anti-freeze required.