I was doing some testing of my tap water tonight, and noticed some strange behavior. Here are my results (I was only testing CH - looking to get a new water softener):
Test 1 - Cold Water (60 degrees) - 380 ppm
Test 2 - Hot water (120 degrees) - 150 ppm
Test 3 - Cold water heated in the microwave (130 degrees) - 160 ppm
Test 4 - Cold water allowed to come to room temp (70 degrees) - 400 ppm
What gives? I've checked Taylor, and here, and I'm not seeing any documented link between temperature and calcium hardness results. I initially thought maybe my water heater was somehow removing hardness from the water, but the microwave test disproved that. Is there some compensation factor that needs to be applied to the calcium hardness test based on water temperature? Thanks!