Nano Filtration TFC dry nf membrane 100 gpd by BARC (Bhabha Atomic Research Centre transferred technology). Its pore size is 0.001 micron and rejection rate is 40% to 50% and retains mineral TDS between (50% to 60%) in drinking water naturally. Initially purified water 15 ltrs water need to flush, the water becomes crystal clear and clean and then check the TDS of purified water. The result would be as per mentioned descriptions. The membrane is suitable for almost all kind of electric operated RO domestic water purifiers. For better result, use with 100 GPD booster pump and 450 CC FR. The membrane is suitable for soft water having TDS between 150 ppm to 350 ppm. The water born microbes/germs/virus size remains between 0.01 micron to 5 micron those are eliminated with 100% surety and being flushed through rejected water. The membrane also eliminates harmful chemicals, pesticides, herbicides, toxicity, bromide, fluoride, cyanide, arsenic etc and other impurities from water and flushes them through rejected water but UV & UF cannot. Life of this membrane is around 15000 liters or 15 months whichever is earlier. As per WHO, BIS and EPA recommendations the drinking water up to 300 ppm remains in excellent range for drinking. We intake up to 10% minerals from water which is very important and therefore always keep your drinking water mineralize else extremely soft water may cause bone problem, slow metabolism, weak immune system, early ageing, hair fall etc. Normally like DJB, BMC etc maintains pH level in drinking water between 7 to 8 pH, so no need to use ionizer/alkaline cartridge. This membrane not lowers the pH value of purified water. Please do remember the TDS adjuster/controller technology may add impurities in your drinking water if exist in raw water. Therefore instead of using TDS adjuster always use NF40/NF60/NF80/RO membrane according to your raw water hardness.