I'm seller at Penang & Sbg. Perai area, but not selling 3M...

I think what you mean is the outdoor water filter that can be backwashed instead of require the help of technician to maintain.

This type of filter is more expensive but more convenient, do backwash yourself once-a-while, instead of need to do appointment with technician to maintain etc.. Some more, some technician might charge you everytime, might result in similar or even more total expenditure.

p/s Amway sell outdoor water filter too (1 model only), but it's quite $$ which people don't usually use it if they already have indoor filter like eSpring, but good for prolong the lifetime of indoor water filter cartridge if the water of pipe really contain many large particles