I bought a pool never been used but they had it for 5+ years... It didn't come with instructions for my pump and sand filer please explain to me step by step instructions of how to use this, I get where the hoses all go and stuff but I have these weird plumbing stuff I'm assuming goes into the sand filter tank, I can send a picture via email and I don't know anything about back washing how to add the sand or any of that all I know is it requires 90 lbs...