Gravel In Bottom of Sand Filter

[fmcardenas]

I am swapping out the sand in my sand filter and my pool store person told me that when they install a sand filter, they put a layer of gravel in the bottom of it. We picked the bag of gravel up along with the sand but, I did not see gravel in my filter after I cleaned all the sand out of it. Any thoughts on this or does anyone do this now?

 

[cheddar85]

I think older sand filters needed a layer of gravel on the bottom, but newer high rate filters don't use it. So depending on what kind of filter you have, you may need it, you may not. If there wasn't gravel before, I honestly don't see a reason for it now.