Issue link: https://read.uberflip.com/i/398980
< Means less than and > Means more than Water Hardness Classification CaCO 3 equivalent (mg/L) Soft <75 Moderately hard 75–150 Hard 150–300 Very hard >300 Tip: Levels which are too low require the addition of a Hardness Raiser or Calcium Chloride. Recommended range for calcium hardness is 180- 250ppm. If too high a product that suspends the calcium in water will be needed. Calcium Hardness levels will be tested when you take your pool water to your Pool Professional. Remember: Water balance is about pH, Total Alkalinity and Water Hardness. IT'S ALL ABOUT BALANCE! 23