ExPat Brit living in the Philippines. I have an American standard hand basin installed in the bathroom - Single cold feed, with a popup plug - Problem the first part of the P trap clogs with a black mass from time to time easily cleaned via the clean out port. - Question is, considering the only use is for my infrequent shaving and regular tooth brushing and hand washing nothing else goes down the basin. Is it because of the cold feed only that the clogging occurs?
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