TDS could be collecting on the insides of your bin as well, maybe just rinse then DRY it out once a month or so, you will be shocked what you see on the cloth you use to dry it out...brown gunk!
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Cheers Ronnie.
75 gallon in-wall SPS dominant and some sweet zoas, attached 30 gallon refugium/seahorse tank, attached 15 gallon mangroves/bad boy tank/pod factory, 40 gallon sump.
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