Is your filter really getting cleaned?
DE filters aren't always completely taken apart. 

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DE Filter Cleaning
Proper protocol includes the following:

1. Open the filter
   
2. Disassemble the unit
   
3. Power-wash each filter grid
   
4. Inspect for rips or tears
   
5. Reassemble filter grid
   
6. Install
   
7. Test, and add fresh DE
   
8. Plus, we even send you photos - before and after!

Filter Cleaning Special:
Complete pool inspection and filter cleaning (cartridge or DE) $75 ($125 value)*
*Must be done every six months