Having a problem I've never noticed before. Every time I start up my sand filter, it emits a white cloud. Then, the outbput from the filter clears up. The pool then gets a little cloudier for a couple of hours before it is clean again. Doesn't matter whether its turned to waste or if I've just rinsed it, it always does the same thing once I go back to filter.

Thoughts anyone? Should I backwash?