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Tetra "KH" Test Kit

After doing some exhausting experiments last weekend, I've pretty much
satisfied myself that the Tetra "KH" test kit is simply an alkalinity test,
just like some folks have been saying all along. This means that if
bicarbonates are the dominate buffering agent in your water, the "KH" test
will be pretty close to carbonate hardness and the readings will work well
with the CO2/KH/pH tables. If you have phosphates or other buffers in your
water, you're out of luck.

George Booth, Ft. Collins, Colorado (booth at frii_com)
Need info? http://www.frii.com/~booth/AquaticConcepts.htm 
           Major updates with lots of photos, Aug. 28