Strange Purple Pool Stains?

Question

Hi, this question is for my Dad. Recently, strange stains have been appearing in our pool. These stains are actually large areas of spreaded purple powder. The powder collected on the bottom of the pool. If we sweep it up, it just settles somewhere else. Does anyone know how to get rid of these spots WITHOUT draining and refilling the pool or changing/cleaning the filter? Thanks! Also, we would greatly appreciate it if anyone could also tell us the source. Gracias!

Answer 1

if you are using copper sulphate as an algaecide,that could be the source.....or copper from a heater's heat exchanger if the water is aggressive