Do I need to add more D.E. to my Pentair Plus Fiberglass D.E. pump after backwashing?

[scombs2000]

Hi! Do I need to replace the D.E. in my filter every time after backwashing?

 

[HermanTX]

you are to add DE after backwashing. However, only add 80% of the full charge DE requirement. This is because you do not 100% remove all the DE when backwashing.