Conventional spa pool filters trap particles as small as 50 microns (50/1000th of a millimetre) the Purezone micro filtration is 10 times more effective, trapping particles as small as 5 microns. Purezone filters do not require cleaning. They are disposable and should be replaced every 3-5 months. You can purchase these at www.spastore.com.au
You can recognize a Purezone (micron) filter by its distinctive honeycomb appearance.