American Water Heater Company  
   Sales of water heaters, parts and accessories. Includes sizing and troubleshooting guides and water heater diagrams.
   http://www.waterheaterparts.net/

Worldwide Water Systems  
   Water softeners, filters, home test kits, and reverse osmosis systems.
   http://softwaterdeals.com/

PurePro USA Corporation  
   Buyer's guide for home reverse osmosis water filter systems.
   http://purepro.net

Premier Water Systems  
   Reverse osmosis water purification products, parts and filters. Includes FAQs and troubleshooting guide.
   http://www.premierh2o.com/

Cordonna Associates, Inc.  
   Water treatment products and information - water softeners, reverse osmosis systems, ultraviolet disinfection, iron filters.
   http://ewateronline.net/

Pure Water Canada  
   Information about water purification and treatment with system sales available.
   http://www.purewatercanada.com

WaterGeneral  
   Features a reverse osmosis system which includes water quality TDS meter. Also links to replacement filters and membranes for some popular brands.
   http://www.watergeneral.com/

SpectraPure  
   Reverse osmosis and deionization water purification products. Includes general production information and company profile.
   http://www.spectrapure.com/

Ozone Pure Water  
   Offers water purification systems to eliminate iron, sulfur, manganese, and bacteria. For residential, commercial, and industrial water problems.
   http://www.ozonepurewater.com/

H2O Instruments  
   Offers water testing instruments, home reverse osmosis systems and water softeners by Fleck.
   http://www.h2oinstruments.com/

National Testing Labs Watercheck Analysis  
   Water testing for home drinking water potability and well water. Products and information available for residential and commercial. Independant testing lab.
   http://www.ntllabs.com/

Sanosil  
   Sales of water purification devices, and information about the company and its disinfectant products.
   http://www.sanosil.com/-shop-m.htm

Discount Distillers  
   Durastill brand water distillers. Includes product specifications. Order by e-mail.
   http://www.discountdistillers.com/

Purco Filtration Systems Inc.  
   Water treatment and purification systems for residential, commercial and engineered applications.
   http://purco.qc.ca/

Reid Hester  
   Offers GMX water softeners based on magnetohydrodynamics.
   http://watersoftener.net/

Fleckvalves  
   Home and industrial water treatment equipment including softening, filtration, reverse osmosis. Water systems for Kidney Dialysis Centers and patients are also available.
   http://www.fleckvalves.com

Aquatechnology Water Stores  
   An informative site dedicated to accurate and educational resources along with a full product line of water treatment equipment.
   http://aquatechnology.net

Magnetic Water Treatment and Filtration Products  
   Suppliers of simple to fit magnetic water softeners, reverse osmosis water purification and filtration equipment for home and industrial use.
   http://www.h2onics.co.uk

BuyRO  
   Source for reverse osmosis Pure Plus water systems.
   http://www.buyro.com

Catalytic Water Softeners  
   Hassle-free soft water without salt, electricity or chemicals. Manufacturer of premium catalytic water softeners since 1988. Money-back guarantee.
   http://www.no-salt.com

Ace Pump Corp.  
   Water filtration, reverse osmosis systems and bottle-less water coolers from the worlds leading manufacturers that will provide clean and safe water for drinking, cooking and showering.
   http://acepump.com/

Water for Life Corporation  
   Water for Life manufactures and distributes ultraviolet water purification systems for point of use, whole house, and commercial applications.
   http://www.wflcorp.com

Water Refining Company  
   Specializes in quality water conditioning equipment such as water softeners, filters, reverse osmosis and aerators.
   http://www.waterefining.com

Water Value Company  
   Filtration equipment, parts, and replacement filters. Also information on installation, repair, owner's manuals, and articles on drinking water contamination.
   http://www.watervalue.com/

Water Filtration  
   Suppliers and Installers of domestic and commercial water filtration systems, water softeners and water conditioners.
   http://the-waterworks.7p.com/

Avonsoft Water Treatment  
   Manufacturers of domestic and industrial water softeners. Suppliers of Doulton and Berkefeld ceramic bacteriological water filters and spare candles. All types of filters supplied.
   http://www.avonsoft.com/

A1waterfilters  
   Offers residential water filters, shower filters, house water filters, air purifiers and air cleaners.
   http://www.a1waterfilters.com

Harvest Water  
   Sells reverse osmosis systems.
   http://www.harvestwater.com

Trentatronics  
   Manufactures and supplies of magnetic water conditioners.
   http://www.trentatron.com

DaSu Distributing  
   Offers tankless water heaters and on demand hot water heater systems. Featuring gas and electric.
   http://www.mytanklesswaterheaters.com/