With cya of 90, you need to be shocking your pool up to 20 and try to maintain that level until the pool clears and you can go from sundown to sunup without losing more than 1ppm of chlorine. Test as often per day as you can (at the very minimum 2x per day although more often is better) and each time take it back up to 20. Also run the pump 24/7 while clearing the pool and backwash when the pressure increases 8-10psi over your clean filter pressure.
When you get it all clear, you can let the cl drift down but keep it between 5-10 ppm all the time to avoid another algae bloom. No more tabs in the feeder as they will continue to add more cya.
Hope this helps and, welcome to the forum.
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