did some research

for 3M :

http://nsf.org/Certified/dwtu/listings.asp...er&Program=DWTU

NSF standard 53 - 
Cyst Reduction
Lead Reduction
MTBE Reduction
Turbidity Reduction
for Tupperware :

http://nsf.org/Certified/dwtu/listings.asp...er&Program=DWTU

NSF standard 53 -
Asbestos Reduction
Chlordane Reduction
Lead Reduction
Mercury Reduction
MTBE Reduction
PCB Reduction
Toxaphene Reduction
VOC Reduction
for ESpring :

http://nsf.org/Certified/dwtu/listings.asp...er&Program=DWTU

NSF Standard 53 -
2,4,5-TP (Silvex) Reduction
2,4-D Reduction
Alachlor Reduction
Asbestos Reduction
Atrazine Reduction
Benzene Reduction
Carbofuran Reduction
Carbon Tetrachloride Reduction
Chlordane Reduction
Chlorobenzene Reduction
Dibromochloropropane Reduction
Endrin Reduction
Ethylbenzene Reduction
Ethylene Dibromide Reduction
Heptachlor Reduction
Heptachlor Epoxide Reduction
Lead Reduction
Lindane Reduction
MTBE Reduction
Mercury Reduction
Methoxychlor Reduction
O-Dichlorobenzene Reduction
PCB Reduction
Radon Reduction
Simazine Reduction
Styrene Reduction
Tetrachloroethylene Reduction
Toluene Reduction
Trichloroethylene Reduction
Trihalomethanes (TTHM) Reduction
Toxaphene Reduction
VOC Reduction

What do you mean your sink built in? Where does the water tap come out from? Surely can drill, even on tiled concrete top can drill. I got Unity Kitchen to come back to drill a hole in the already installed quartz top. They were very obliging.

If you are looking for something good yet affordable, 3M AP Easy Complete would be suitable. YOu do not have to worry about after sales service as we will follow up and assist you if you need to claim warranty and etc. 3M is a reputable company and we (Builders Hardware) is very reputable in lowyat forum for good price and service. With the 3M & Builders Hardware reputation, the certifications from NSF and healthy forumers who are still alive after using 3M (NIckLJF), what else can go wrong?