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hoppycalif · 12-13-2006, 11:49 AM

I experimented with the AP test kit, adding varying amounts of the pH reagent to tubes with the same water - tank water - in them. It made no difference to the results whether I used the three drops the instructions call for, or 2 or 6 or even 9 drops. With larger numbers of drops the result becomes a murky opaque liquid, where reading the color is harder, not easier. But, the color stayed the same for all. So, I just add whatever amount makes it easiest to judge the color.

12-13-2006, 11:49 AM	#142 (permalink)
hoppycalif Senior Member Join Date: Apr 2005 Location: Sacramento, CA, USA Posts: 5,208 iTrader Ratings: 20 iTrader Positive Rating: 100% Plant Points: 227345	I experimented with the AP test kit, adding varying amounts of the pH reagent to tubes with the same water - tank water - in them. It made no difference to the results whether I used the three drops the instructions call for, or 2 or 6 or even 9 drops. With larger numbers of drops the result becomes a murky opaque liquid, where reading the color is harder, not easier. But, the color stayed the same for all. So, I just add whatever amount makes it easiest to judge the color.