Nice to be back, this site helped me several years ago.

[michael3]

Thanks, Ben
I have noticed that the sand only blew out on initial backwash after adding the new sand, so maybe it wasnt settled down or perhaps maybe alittle to much sand? any ways it has quit doing it lol. The filter is running longer and longer without losing water flow pressure, maybe it is just that nasty. One thing I`m not sure of, I know there isnt any cya in the water or its very low, with the amount of backwashing I`m doing should I worry about adding that right now?

[PoolDoc]

Yes, losing sand on FIRST backwash could have been overfill, OR sand spilled into the tubing.

If you use dichlor (Sams Club is the best source -- EVERYbody else sells blended or diluted dichlor) you'll be adding chlorine and dichlor.