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Yes, swimming in a pool with high calcium hardness is considered safe as long as you have sufficient chlorine and pH levels to keep bacteria growth under control. The main issue with high calcium hardness is that it damages your pool through rust and corrosion. However, if your water is hard enough to corrode your pool, you might want to consider finding methods to make it safe for drinking at home.

It’s a good idea to run the pool pump while swimming because your filter and skimmers will be active to help keep the water clean. Additionally, if you have pool features, you would naturally keep those pumps running while you swim. However, it’s not a requirement to run your pump while you swim.

An easy way to know whether your sand filter has enough sand is to check how full the filter is and what the sand looks and feels like. The filter container should be two-thirds to three-quarters full of sand. Look for interior marks indicating the ideal sand level. If you put your hand into the sand, it should flow through your fingers without clumping. The filter pressure gauge is also an easy indicator—the right amount of sand leads to normal pressure, while too much or too little sand can cause high or low pressure.

A swimming pool pump has to have water in it to run properly. If the pump isn’t primed and tries to run when it’s dry, the components will overheat which can cause the pump to seize up and can even damage the PVC pipes that carry the water into and out of it. Essentially, running a pump that isn’t primed can lead to having to replace the entire pump.