I am having a lot of trouble getting the cover off the bottom skimmer that goes into my filter, is there a tool you can use to take this off? Right now I am using a screw driver and wedging it in and using it to rotate the cover, and this works but puts a lot of strain on the housing. Also what do I need to do to winterize my pool. I usually take the filter apart and take the motor inside and leave the sand container near the pool because it is to heavy to move. I do not normally put any chemicals in before putting the winter cover on, should I be adding something because I always have a hard time getting it clear in the spring, also cover tore last year so I am in need of a new one and info on what kind to purchase would be great. Thanks in advance for any and all input.