We have been in this house for 4 1/2 years. After the first summer, it was recommended (by Leslie's) that I replace the existing DE filter with a Jacuzzi J-CQ420 cartridge filter. I may have made a bad decision based on their advice that it would only need cleaning twice a year, but I now think that advice was purely to sell a cartridge system as it has needed cleaning a lot more often than that, and the cleaning is much more laborious than I expected it to be.
The cartridges are at the end of their life, so I need to consider buying new ones or replacing with a filter that can be backwashed, so I am seeking recommendations for either sand or DE for a 10k pool. Please kindly explain briefly why you make your recommendation.