5 Things to Know About Pool Water Calcium Hardness

Low calcium hardness is an easy fix Add calcium chloride sold as hardness increaser. Follow the label, brush the pool, and test again in 24 hours.

High calcium hardness requires dilution No chemical safely removes calcium from pool water. Sequestrants only prevent scaling, not lower the number. Drain some water and refill with fresh.

Test your fill water first How much you drain depends on your fill water’s hardness. Test that before deciding.

Hard fill water means ongoing work If your fill water is naturally hard, common in desert areas, routine partial drains become a seasonal chore.

Both extremes damage your pool Low calcium eats plaster and grout. High calcium clouds water and leaves white crust. Neither is an emergency, but both need a response.