Preventing the growth of algae in swimming pools?

Algae is not cause by soapy swimsuits, or what you wash them in. It's caused by low levels of chlorine or non at all. If the chlorine is too low and the sun is shining that is a breeding ground for bacteria and algae. To prevent algae watch the levels of chlorine and shock regularly. Don't forget to put in algaecide as well, that helps prevent it too. Wash your swimsuits in whatever you like, but make sure that after they are freshly washed that you rinse them well before going in the pool. Bathing suits will most likely cause foam or sudsy looking water, not algae.