I'm preparing to plumb in a new Pentair CCP520. It is replacing a Pentair FNS Plus 60 DE filter. The DE filter is 24 years old and I'm constantly getting DE back into my pool. I've gone over all the usual culprits. I'm done with DE. Now, before I plumb the new filter in, should I find a way to get as much DE out of the pool as possible? Can I just vacuum up the DE, sending it to the new cartridge filter, and then wash it out of the new cartridges or will the DE plug up the cartridges?