My current CYA level is 90 due to the use of Pro Team High Tech chlorine tabs. I would like to switch to liquid chlorine for the duration of this swim season (beginning of October) without draining 1/3 of the pool water. Can I switch to liquid chlorine now with high CYA levels? How much extra chlorine (and how often will I need to add it) will I need to use now if I do not drain 1/3 of the pool until October?