The hardness level in hot tub water should always be between 150 to 250 ppm.
The hardness level is determined by the amount of calcium in your water. It’s more common to have a low hardness level than a high one.
An improper hardness level can cause increased foaming, cloudy water, and if left uncorrected it can cause damage to your spas equipment and even create scaling on your spa shell surface.
HT Liquid Calcium is the easiest way to raise the hardness level in your hot tub and because it comes higher concentrate then most other brands, it does not require a lot to add in.
To raise the hardness level 28 parts per million in a 250-gallon spa takes just 2 ounces. Obviously, double that for a 500-gallon hot tub.
The chart on the bottle gives you a simple guide on how many ounces to add depending upon your current hardness reading and the size of your spa.
Before adding HT Liquid Calcium make sure your filtration pump is running, then pour it in and wait 30 minutes, then retest and add more if necessary.
Good news is that once you correct your hardness level it usually will stay corrected until you refill your spa.
Our 4-Way strips test for hardness, but we also make available test strips specifically for testing hardness levels that provide a more detailed test.