Quote Originally Posted by blk133
Yours then is Hayward EC 65 or EC 75. Do a search in google for Hayward EC 65 and look at the picture.
I have EC65 (beige), they used to be beige, now they make them in gray color

My pressure is between 18-20 with 1 1/2 inches piping
Some info I found on backwashing:

Turn pump off.
Open backwash valve.
Bump handle slowly 15 times.
Turn pump on and run it for 2 minutes.
Turn pump off.
Bump handle slowly 15 times.
Turn pump on for 1 minute.
Turn pump off.
Close backwash valve tightly.
Turn pump on.
Add D.E. to the skimmer located closest to pump.
For Hayward EC-40 / EC-50 Filters use (3) 1 LB coffee cans of DE
For Hayward EC-65 / EC-75 Filters use (5) 1 LB coffee cans of DE (some websites say for EC-65 it's 6 lbs and for EC-75 it's 7 lbs)

I don't think it will hurt to put 6 lbs even if it's 5 that it needs.

Add D.E. to skimmers SLOWLY. Don't CLOG them !

Check pool water level after backwashing - add more water if necessary !

Hope this helps.

B.
thanks I think your right.

I just found some paperwork the previous owner had left and he said to add 6 lbs of DE after backwashing.