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Old 05/18/2018, 01:49 AM   #5
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Tastee's Avatar
Join Date: Oct 2017
Location: Sydney Australia
Posts: 174
Thanks mcgyvr.

I do run a skimmer so may give the Phos-correx a go at some point.

My test kit is a Red Sea Phosphate Pro, so yes hobby grade only. That may indeed be it's margin of error.

Iíll try to get hold of some distilled water and see what that tests at.

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