I'm having problems with my water spray, have above ground pool and it barely sprays, i have made sure the skimmer and pump basket are clean. my pump is an Aquapro san filter and 3 yrs old. Do I need to replace the sand maybe, and where can I find instructions on this, as my manual does not show it. is there a certain type of sand that is best to use? This is my first pool and learning everyday, any help is appreciated.