Through years of trying to get rid of algae by shocking (no longer do that by the way) my CYA level is upwards of 100. I keep my free chlorine level at the recommended level for the CYA and the water is absolutely sparkling crystal clear. I know I have to dump water and refill to fix the problem but would like to hold off a bit since right now the pool is seeing quite a bit of use. My question is would a free chlorine level of around 10-12 cause any harm to the liner or anything else?