Cleaning filter socks

[Reef_Geek]

for removal of chlorines (not chloramines), use SODIUM THIOSULFATE

I don't know why aquarium hobbyists haven't caught on to its use, but it is very common practice in aquaculture. It's commonly available from pool supply places... it's what pool maintenance uses to reduce chlorine in swimming pools.

Dissolve sodium thiosulfate (a table spoon or so) in a 5 gallon bucket of freshwater, and soak overnight whatever you're trying to neutralize in residual chlorine.

When I was managing marine ornamental aquaculture and needed to sterilize something (tank, habitat etc)... I'd use pool supply chlorine for a soak overnight, then another soak with lots of sodium thiosulfate.