Here is the device from Hanna Instruments, HI 98301, which i will be using to get the results from various water filter products, unlike the basic models used by most RO sales people this device is on the higher end. Complete with the calibration liquid (which u need to use to reset the device if the reading begans to sway). Total cost me around RM 300...
Pandan indah tap water
Ampang tap water
Boiled water from (pandan/ampang)
Puchong tap water
Diamond water on Ampang
Amway Water Treament
Pensonic Twin filter on Pandan
Panasonic PJ3RF on Pandan
Pensonic Twin + Panasonic (combined)
32 (without carbon block on pensonic, both poly)**
Cactus mineral water (Esso station)
EconSave 0.20c Mineral Water
RO Water “water factory”
Delcol RO Water Unit (not serviced yet)
Delcol RO Water Unit
Distilled Water from Petrol Station
Conclusion : None of the water filter are able to filter anything significant when it comes to dissolved chemicals, except the activated Carbon filtration of chlorine and the dirt filtration of raw sediments, mud, rust and sand (except RO water filters). None of the water filter adds any minerals that is significant to the readings.
**May 26, 2007 : Now i seriously recommend using the combo unit of Pensonic + Panasonic, however, do not use the default Pensonic /Nishimen carbon block, for some reason when using the carbon block, the PPM readings goes up by 2. Eg, 32(tap water) to 34 (after filter). This is however NOT a normal filter behaviour,
because on a Panasonic model PJxx that comes with carbon filters, the readings does NOT go up.
Use both poly filters on the Pensonic, route it to the Panasonic for carbon filtering.
See here for how it to make such a unit.