Under Sink Reverse Osmosis Water Filters

WHOLE HOUSE  |  UNDER SINK  | COUNTERTOP

To inquire about the right water filtration system for you, please email help@crystalquest.com or call 1-800-934-0051

Under Sink Reverse Osmosis & Ultrafiltration systems have 12 to 17 stages - the number varying with model and options of Reverse Osmosis/Ultrafiltration Systems. Crystal Quest Reverse Osmosis/Ultrafiltration systems produce up to 100 gallons of top quality water per day and reduce dissolved contaminants such as lead, fluoride and nitrates by forcing untreated water through a semi-permeable membrane with pores of about 0.0001 micron (CDC). Pressure forces the water to flow in the reverse direction to the direction of flow in natural osmosis. View our Comparison Chart of all Under Sink Reverse Osmosis THUNDER® Systems.

UP TO 100 GALLONS PER DAY

Crystal Quest® THUNDER® systems pair an ultrafiltration (UF) prefilter and SMART and carbon block prefilters with a 100 GPD reverse osmosis membrane and a carbon (C Series) or SMART (M Series) post filter. They are designed and built by a US manufacturer with more than 30 years of water treatment experience.

Crystal Quest Reverse Osmosis/Ultrafiltration systems have compact designs that can easily fit beneath any kitchen or bathroom sink. Supplied with a complete installation kit that includes a European lead-free long-reach designer faucet.

Our Reverse Osmosis Systems use a thin-film composite (TFC) membrane to produce permeate (excellent) water without odor or taste. Learn more about our Reverse Osmosis Membrane. Permeate water may be acidic (low or absence of mineral content). For healthy drinking water, remineralization is recommended. 

THUNDER® C SERIES

The Thunder C Series uses a 3-stage Granulated Activated Coconut Shell Carbon (GAC) Filter Cartridge & post membrane cartridge, to remove volatile organic carbon compounds (VOC’s), insecticides, pesticides and industrial solvents.

Buy a C Series Replacement Cartridge.

THUNDER® M SERIES

The Thunder M Series uses a 6-stage Filtration Cartridge, pre one-micron filter pad, RO membrane cartridge, ERA-6500®, ERA-9500®, GAC (coconut shell), ceramic ball resin, and post one-micron pad. 

Buy a M Series Replacement Cartridge.

THUNDER® P SERIES

P Models include a pressure pump. Please consider these models if you have low water pressure.