Hello, I am new to the DIY pool care. I am maintaining a 11K gallon pool/spa combo in Austin, TX. I recently survived the Live Oak leaf and pollen drop from mid-March thru mid April (that was a lot of daily pool work!). Now that things are back to normal, I'm doing homework on no-drain options cleaning up some blotchy and mottled colored plaster. I appreciate the collective wisdom this TFP forum!