QUOTE(skng03 @ Feb 24 2012, 10:37 PM)
I tried those cheap 5micron cartridge from hardware shop, it useless lar.
u try to get one inside jusco, not small shop outside jusco. Brand ue-tec if i remember collectly then u compare the quality:)
Running 3 filter in parallel is a good solution but not quite suitable for condo/apartment lar.
And i use ss rocket type filter now since i move to my current house, no need the hassle to change the cartridge

Agreed there are many brands and I also come across those expensive ones. The important thing is the brown dirt didn't show up at the middle/center of the filter cartridge, meaning the dirt did not pass thru. For sand filter it is 10 microns to 20 microns and if you dont backwash often the rust dirt will get into your house. Back wash take too much time and a lot of water wasted and can never backwash completely unless the water pressure is very high and you backwash a few times one go. If you are a sand filter user you will know when you back wash the dirty water come out and in a few minutes the water turn clear but when you backwash again immediately brown (not as brown as first time backwash) water coming out again. That mean the backwash is not effecient.
Sand filter will reduce flow and pressure. And most of all you got to backwash weekly, not monthly. One sand filter RM1xxx you can buy many many many......... filter cartridges over many years beside the troble to backwash and wasted water that you could use to shower plants. For all these reason plus sand getting into my tap, tanks, washing machine, etc that is why I go for this simple yet effective solution. When face with problem we are push to be creative.
For condo you might want to use two in parallel, I used to use 4 in parallel. Because have to change 4 so I reduced it to 3 and now to 2 only becasue the flow and water pressure was not much affected and my areas water pressure is high 40 to 60 psi. That is why I said algae grow when I shut one off. Becaue of that I cut them off and now use two. For areas with low water pressure use 3 or 4. The more in parallel the more complicated and space required to fix them.
Use a bit of imagination you can have parallel for apartment too. There got to be a way when you have the will. Why not take a pic and I might be able to give you some idea.