Please advise on understanding guidance in manual for new Pentair Clean & Clear RP Filter. It says note; "When the cartridge is element is used on new pools and after cleaning the elements, introduce into the system .5 pounds of diatomaceous earth per over 100 square feet of pool area. Mix it with water and pour it into the skimmer after pump is running to enhance filtration.
My pool isn't new, but the filter and cartridge are, do I add the DE under my circumstances?
Thanks in advance!