[jbolinger]

Is Polyolefin heat shrink tubing aquarium safe? This is the dark Gray/Black stuff used for electronic wiring.

Anyone have any experience with using it in an aquarium?

I am considering using Omnione whole house water filters (less than $23 at Menards for the transparent ones! Nontransparent even less.) on my tank. Looking at the way they work, the water enters at the outside edge and leaves through the center. I was thinking of canibalizing a filter cartridge and sealing the tube to force the water to the bottom of the canister. In this way I could fill it with Purigen, pot scrubbers, etc.

Jim