Multiply by 10 or 50?

[waterbear]

I believe the HTH kit is based on Taylor reagents and the multiplier is 10 becuase this kit has better resolution. I don't know for sure but I also think the HTH kit tests for calcium hardness while the Aquachem kit is testing total hardness.
Walmart seems to sell either kit based on geographic area.

[dawndenise]

Thanks for the reassurance. The HTH kit gives instructions for the "total hardness test" but the last step of the instructions for this test state, in part: "Record as parts per million (PPM) total hardness as calcium carbonate."

Sandy