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Old 01/01/2018, 09:34 AM   #1
Plumbing Engineer
Join Date: Feb 2004
Location: Atlanta GA
Posts: 3,232
How to kill sponge in pipe?

So I have an over the back closed loop on my tank with a pump located about 30 feet away in the basement. Its been going for about 9 years now and has apparently grown a ton of sponge inside the piping. Every time the pump comes on bits of sponge shoot out and its driving me nuts.

So I can obviously turn off the pump and drain the loop, but whats the best way to dissolve all the sponge and still be able to clear it out and be safe to turn back on once done?

I was thinking vinegar, but Im not sure of what concentration to use since the loop is about 10 gallons of piping.

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