Hoping for someone to shed some light on that age old problem of pool security. We have a holiday home which is regularly left empty and are about to have pool installed. I've just read in an old message to this forum recommending a rigid, roller shutter- type security cover above all else, but we have been told that the water quality (saltwater pool) may be affected by leaving such a cover in place for long periods. Can any one give me any other advice? Thanks.