And, to add to what Janet advised --- keep an eye on your ph. Epecially with all the rain, your ph may drop. Ideal ph is between 7.4-7.6. 7.2 is OK, 7.0 is the bare minimum. Anything lower than 7.0 is acidic and will damage your pool. You can use 20 Mule Team Borax (in the laundry aisle at Walmart) to raise your ph if you need to.