jamesking

Originally Posted by PeaceFarmer

A good ph meter wont cause this problem...having worked in a lab for many, many years (and subsequently having to test the ph of thousands of different reagents) I can give you a few pointers:
1. You have to calibrate your ph meter at least every two weeks if you can (never go more than a month). You can purchase the calibration solution for a few dollars online. To calibrate (I use a two point calibration method for accuracy), you dip the pen in the solution and while holding it there, you

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Originally Posted by PeaceFarmer

Ok, if it is only moving .2, consider this a normal fluctuation. Also, you must use ppm in conjunction with ph, not one or the other. Everyday (or every other if you have a large rez) you need to top off the water to replace what your girls drank. However, all of the missing water isn't just water that they drank, but also evaporation, and other sources such as leaks..the list goes on and on. you you change your Rez and adjust it to 1400ppm and a ph of 5.8...2 days later you find you need to top

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