Same cuvet, well rinsed with RO/DI water directly from DI chamber (0 PO4).
I get residue from somewhere EVERY time I test my RO/DI holding tank? Seems unlikely to me.
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150 gal Custom. Born 5/7/07. 50gal, 29gal, 20gal Sumps. 30gal Frag Tank. ETSS 800 Skimmer, Deltec APF600 Skimmer. PFO Solaris Lighting on Display and Frag Tank
My Tank Thread
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