In early Sept 2013, I moved into a rented house and immediately installed a simple water filter near to water tap. The 'white' cartridge  became brownish after 20 minutes of water run, and by 5th day, the cartridge became totally  'black'. Landlord and I went to PJ  SYABAS Office ( near to Assuatn Hospital) and showed the pictures of dirty cartridge.

Within 3 hours, Environmental division ppl of SYABAS came to the house, took sample of water at the meter outlet (before water entering the water filter) and  measured chlorinity, turbity and PH. The SYABAS guy said based on their guidelines (which he showed me), the measured values  demonstrated  that water coming into my house from the SYABAS pipe  is 'fit for drinking', even without my water filter!!

Here is picture of the measured results and brown-color of the filter cartridge (vs the original white colour) after 20 min water run.

SYABAS must be joking, right?  water fit for drinking?  Malaysia Boleh