Reddit mentions of Filter Flosser Pool Spa Cartridge Cleaner Water Pressure Jet Cleaning Tool

Always happy to help! Cartridge filters can be fine, but unless you want to replace them every other month make sure you clean them every week to every few days - if you have a pool party with a lot of kids or sweaty people, shock the pool after straining solids, add clarifier, and clean the filters the very next morning.

I might also recommend a hose-adapter to clean cartridges called a filter flosser (https://www.amazon.com/dp/B01LQOMXL2/ref=cm_sw_r_cp_apa_i_jY-OCbCG0RK6M) and has been a lifesaver for me in the past. There are also cartridge soaking chemicals, and I'd recommend soaking and cleaning once every 3 months if regular maintenance is upheld.

Also where you have a spill-over setup, I would strongly recommend always having a spare set of filters available. They're pricey, but cheaper than replacing your heater.

Make sure you have a reliable flow meter installed just BEFORE the filters so you can watch flow yourself, and ask your technician what the minimum flow for your heater should be. If flow gets reduced too much while heating, you risk damaging or destroying the fire pot or elements. Not all systems have flow cut-offs, and not all cut-offs are perfectly reliable.