Jacuzzi Filters help keep the water clean. Without it your water will get dirty very quickly and you would have to replace it regularly. Designed for optimum flow, it is advisable to install the Jacuzzi Filter on the suction side of your pump. This will help with Jet Pressure and also filter out any unwanted particles before they enter the heating system
Below is a picture of what the Jacuzzi Filter Cartridge looks like. The way you see it is what it looks like when its new. However, an old broken Jacuzzi Filter Cartridge will effect the cleanliness of the water tremendously and should be checked regularly.