A pool that has been closed for 5 years

Welcome to TFP!

Sand filters don't need much attention. If it was backwashed before the pool stopped being used it is probably just fine. If it was left dirty it might have some matted debris on top of the sand, but some extra backwashing will probably take care of that.
 
Thread Status
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.