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APEC Water

"America's #1 Rated RO Water Filter"

Founded 1997 United States mid-range price 50-100 employees

About APEC Water

APEC Water Systems is the leading US manufacturer of residential reverse osmosis drinking water filtration systems. Based in City of Industry, California, APEC designs and assembles all of their systems domestically. With over 25 years of industry experience, they have earned a reputation for high-quality components, long filter life, and responsive customer support. Their systems consistently rank among the top-rated on Amazon and independent review sites.

Known for: Top-rated reverse osmosis drinking water systems manufactured and assembled in the USA

Product Categories

Water Treatment

APEC's premium reverse osmosis systems deliver bottled-quality water straight from the tap. Their Essence series and WFS-1000 are top sellers, featuring 5-stage filtration with long-lasting filters, quick-connect fittings, and lead-free designer faucets. All systems are designed, engineered, and assembled in the USA with premium components.

Product Lines: Essence ROES-50 Essence ROES-PH75 Ultimate RO-90 WFS-1000 Whole House TO-Solution-15
View APEC Water Water Treatment

Certifications & Standards

WQA Gold Seal NSF/ANSI 58

Warranty

2-year manufacturer warranty; 1-year money-back guarantee on select systems

Related How-To Guides

How to Install a Reverse Osmosis System

Install an under-sink reverse osmosis system for the cleanest drinking water at home -- feed water connection, filter mounting, storage tank, drain saddle, dedicated faucet, and the critical initial flush.
How to Test Your Water Quality

Test your water with DIY strips, reagent kits, or certified lab analysis -- what to test for, how to collect samples, how to read results, and what treatment actually fixes common contaminants.
How to Change Water Filter Cartridges

Swap out sediment, carbon, and specialty cartridges in whole-house and under-sink systems -- the right filters, the right schedule, and the correct order for multi-stage setups.
How to Add Salt to a Water Softener

Pick the right salt, fill the brine tank correctly, break up salt bridges, and keep your water softener running so you get consistent soft water without the scale and spotty dishes.

Common Problems

Bad Taste or Odor in Water

Water that tastes or smells off -- chlorine, rotten eggs, metallic, musty -- has a specific cause for each type. Identifying what it tastes or smells like is the fastest path to the right fix.
Hard Water Buildup

White, chalky deposits on everything -- faucets, shower heads, glass doors, inside pipes and water heaters. Calcium and magnesium restrict flow, kill efficiency, shorten appliance life. About 85% of US homes have hard water.
Low RO System Output

RO system filling slowly, weak trickle, or running out of water? Clogged pre-filters, worn membrane, low feed pressure, or waterlogged tank. Most fixes are filter replacements or pressure adjustments.