This is some of what I have to trade. Looking for cool acros, strawberry shortcake, red planet, rose milli, etc. pretty much anything I don't already have.
Im assuming it's the HI-713 and looks like this one.
http://www.ebay.com/itm/COMBO-HANNA-HI-713-CHECKER-HC-PHOSPHATE-PHOTOMETER-HI-713-25-25-TESTS-/310373243110?pt=LH_DefaultDomain_0&hash=item4843afd8e6
I also had pO4 of higher than 10 on a large FO system drop to 1 in about a week. One needs to be carefull not to remove it so fast in a reef setting.
I can pull out a crystal clear glass of tank water, add one drop of the stuff to the glass, give it a stir and literally watch it bond and...