You won't improve filtration that way; you'll just create a real service PITA.
Instead, buy a bag of labeled pool filter stand (NOT: Quickrete!). Open your filter and make sure that (a) it's full and (b) that the filter sand compares with the sand you bought. If the sand grains are bigger than the filter sand, or rounded, replace the top 12" of sand in the filter.
THEN, order a K2006 testkit AND a bottle of GLB clarifier. Use the kit to make sure that you are managing your pool chemistry correctly and the clarifier to boost filtration a bit:
+ testkits: http://pool9.net/tk/
+ GLB Clarifier
If you want REALLY clear water, purchase THIS filter:Hayward DE6020 Pro-Grid 60-Square-Foot Vertical D.E. Pool Filterand either REPLACE your sand filter OR install this one in parallel, so you can use one or the other.
Hayward SP0715XR50 Pro Series Vari-Flo Control Valve
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