Chemical Balance & Filtration
Chorine is used to help disinfect and sanitise your pool water by inactivating any microbes that may be present. Chlorine is also an effective algaecide.
There are two types of chlorine in your pool, free chlorine and combined chlorine:
Calcium hardness measures the amount of dissolved calcium in your pool water, the recommended range is between 80 to 500 parts per million. Calcium hardness can increase through the regular use of pool chemicals (ie granular chlorine contains calcium hypochlorite).
When calcium hardness is too low, the water can become corrosive. This can damage your pool surfaces, equipment, pipe fittings and pump connections. Your pool walls and floor can also stain. Calcium chloride is used to increase hardness.
If calcium hardness is too high, scaling can form on all of your pool surfaces. The water can become cloudy and swimmers may complain of eye irritations.
Lowering calcium hardness is more difficult and can be done using these steps:
- Drain some of your pool water and replace it with softer water
- Use a flocculent to attract excess levels of calcium, causing it to clump and collect at the bottom of your pool (which will then need to be vacuumed to waste);
- If the above two options don’t work, add acid to raise saturation levels. This won’t reduce the hardness or your water, but will bring your water back into balance.
Checking calcium hardness is only required every 12 months or so, unless you are using calcium hypochlorite to sanitise your pool (then monthly or more regular checks may be required).