I am using Culligam,I think is the best cos my hb read the consumer report b4 we brought .the filter is 0.00001 ,that mean every drop of the water go through the cotton,R.O,and the carbon.we brought it 5yrs ago.we drink more water without boiling .N the TDS (mean the level of clear is 4')B4 filter is 98'at my home .
Nomatter which brand u buy,must have R.O(rev erse Osmosis )
pls call 2790-1881 or www.rofilter.com
hope this can help u.