What other problems could occur with hard water?
Did you know that heat creates Calcium Carbonate? This is a very hard mineral deposit and it can-and does-affect your heater. Once this Calcium Carbonate builds up in the heat exchanger, the heater cannot efficiently heat the water, and it takes longer and consumes more gas than it should. Over time, the heat exchanger will fail and the heater becomes useless. New heaters are very expensive!
A Calcium buildup in your pool pump will eventually cause your pump to fail as well. Did you know that swimming pool pump manufacturers do not warranty pumps (or heaters, for that matter) that have failed due to hard water deposits? Pumps, while not to the extent of heaters, are also very expensive to replace.
How about that algae that you can’t seem to get rid of? For pool chemicals to work properly, they have to be able to assimilate into the water. If they cannot get through the hard water easily, they cannot attack the algae.
Does your plaster look like it has a disease? That is scale or hard water build up, and it is not only unsightly, but also detrimental to the plaster itself. Once your Calcium Hardness levels get high enough, the calcium builds on itself and the blotchy “stains” appear. Some may even look like small stalagmites growing up and out of your pool floor and walls! This scale can also deposit itself in your pool plumbing lines and inside your filter.