>> I did wonder if I could have sourced the chemicals more cheaply but then I
>> wouldn't have known how to actually use them though.
There's no point in adding chemicals that just dissolve the sludge, you need to flush it out down the drain (don't tell the tofu munching, eco warriors). The place I bought earlier this year had a flush machine running most of the day - you should have seen the black sludge that got flushed!
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