hi, I'm new here and live in NSW, Australia. Just researched this forum because I have friends coming for a few days and like my daughter and grandkids they always heap on the sun block. I have a paper filter and in the past the filters have been ruined by sunblock - it just clogs them up and seems to be permanent. i think that I have solved the problem to some extent by these methods: 1 try to get them to put sunblock on at least 15 mins before swimming (not always successful!) 2. I put an old filter into the filter tank for the duration of the stay plus the next couple of days rather than leave a good filter in. The old one is obviously clogged to some extent as the return pressure is lower. 3. I add chlorine each night for the duration plus the extra couple of days. 4. I then return to the newer filter. It seems to be surviving much better than in the past.
Incidentally my pool used to be salt chlorinated but I have changed to an ioniser. With this I tend to put in a cup of chlorine a week approx, but during visor times, I put in a cup each night.
Hope these suggestions help.
Good swimming everyone.