I need to replace my pump. Currently have a 1.0 hp single speed Hayward power flow matrix with a Hayward sand filter pro S-180T. Above ground pool size is 27’, approximately 17,205 gallons of water. Should I replace my pump with the same one or can I go up to a 1.5 hp pump? Also, should I consider getting variable speed or it that overkill for my pool size? Additionally, should I replace the sand in my sand filter this year? This will be my 5th summer with the pool. Thanks for any help and suggestions!