sand filter change

When I backwash, I lose some filter media. This year I was going to change it out but after some research it seems that I just need to top up my filter. I bought some filter sand (aquaquartz) assuming it was same thing, but upon getting it in, I notice it looks different (and smaller) than what...

Hey guys, first time poster, long time lurker ;) I have a commercial account with seven TR-140C sand filters, and they want me to change the sand in all seven. I told them sand doesn't need to be changed unless it's fouled up somehow, but they have deep pockets and they want it done. I'm...