I am using the Salifert PO4 testkit. I totally agree that the colour coded test kits suck. I think the colorimetric meters are too $$ and only test a few things (PO4 not being one of them). There is a MERC Phosphate Test Kit ($79.95 at J&L). With the kit you can measure phosphate levels within the range of 0.14 – 0.008 (P) which equates to 0.43 – 0.023 (PO4 ). My goal is to get the PO4 levels down so the tube is clear which should indicate a PO4<0.015. Time will tell.
p.s. I did see refills for the MERC kit advertised on a CDN LFS website (not J&L) but can't remember which one.
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300 gal starphire custom built in pentagon reef (+90 gal sump on Blue Line 100 HD return pump, 210lb LR, Euro-Reef RC250 skimmer, 2x400W MH, 2x28W compacts, 2xTurbelle classic 4002 pumps & Turbelle Stream 6100 on 7095 Multicontroller, running ZEOvit)
Livestock
Fish: damsels; sailfin, yellow, regal & naso tangs; ocellaris & tomato clowns; lyretail anthias; foxface lo; flame angelfish
corals: a few
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