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If you can isolate the pipe from the sump and tank, set up a pump in a large rubbermaid bucket with fresh water and muriatic acid. Let it circulate for a day or two then replace the water with fresh to get rid of the acid. I do this every couple of years with my return line which runs 30 feet from my tank to my sump. The scrubbing pad on a line helps in this process as well. I found a large round bristle head that I use. It barely fits in the pipe and does a decent job cleaning it.
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Current tank: 340g AGE peninsula
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