Based on my opinion there is no point installing a pre-filter. Customers got AP902 because of the easy maintenance (no need backwash) and the small size. If you install a prefilter, the whole system will look bulky and ugly. It will also be troublesome to clean or replace the prefilter regularly. Hence, defeating the purpose of getting 3M AP902. If there is water disruption, usually SYABAS will send us a notice and do turn off the water supply and remove the cartridge. Once u r back from work, turn on the valve, let the dirty water flow out then only install back the cartridge.

These prefilters used to be very popular back then but maintenance is too troublesome, that is why people switch it sand filter and also 3M


If your 3M got clogged due to the SYABAS water cut, call us and i will teach you how to do a simple manual backwash. However, preventing it by taking out the cartridge is better than cleaning it