A stupid question regarding protein skimmer
I run a rio protein skimmer and it is collecting good amount of "brownish" water in the cup. I was just wondering, the water that protein skimmers collect, is it just liquid waste or water from the tank with the junk? I do have to top-off with fresh water every 4/5 days due to evaporation but would also like to know whether skimmers removes some saltwater too.
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