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Thank you for the link, chem geek. Would you happen to know if the LaMotte Iron Insta-Test measures chelated, free, or total iron? Test results measured zero, whereas the Seachem MultiTest measured somewhat more. Before its powdered-reagent turned brown.

It was purple two-months ago when I first opened it, and is almost black now. It never did clump. Do not remember spilling pool-water into the jar. The air here contains plenty water, and I try to replace the lid expeditiously. Will add a pouch of desiccant to the new container.

Mystery solved! The purple-powder in the jar labeled R-870 is supposed to be white. The Chlorine-measurements between a newly-arrived Taylor FAS/DPD kit and the Hach kit agreed. And the new cylinder did not get any black stains. Thank you for your interest!

Tailor FAS/DPD measured less than half Hach DPD. Had good correlation between the two all summer, then one day the Taylor measurement started measuiring low for no apparent reason. Good point on dilutions. Have been using grocery-store distilled-water, and having faith that that is what it...

I spent years comparing results between Hach DPD kit and two different models of Hach spectrophotometers at a waste-water treatment-plant; they were always quite close. Started using FAS/DPD because I no longer have access to a spectrophotometer, and did not feel the necessary dilutions were...

... compared to Hach DPD and Taylor OTO. R-0871 is ~ 3-months old; it started all at once. Not shaking the reagent enough?

FC = 2.5, CC = 0.2, KH = 120, GH = 290, CYA = 50, NaCl= 580 Concrete pool, Chlorinated by Tri-Clor generator. Shock with Hypochlorite & Muriatic Acid. Concur with you about the alga as Clorine-consumption has been high for three-days.

Thank you for your interest. Filter-pressure is 4-psig when the pump is rotating at 3450-rpm. Have ordered a replacement pressure-gauge. Motor is a single-speed 'special-purpose' model by Emerson, rated 1-hp, and drawing less than half of the rated-current. The impeller is rated for 3/4-hp...

Would it be beneficial to drain the dirty-water from the pressure-side of a PLD70? Dynamic pressure is 4-psig, so media replacement is not warranted. Thanks!