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APEX AQ-4030 Aquarium RO Water Filter System - 3 Stage - Made in USA

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APEX AQ-4030 Aquarium RO Water Filter System - 3 Stage - Made in USA

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Clean Refreshing Aquarium Water for Your Fish & Plants

When you choose an APEX water filter, you'll get the absolute best water filter system for your needs from a company that values your business and will go above and beyond to ensure your full satisfaction.

Built in U.S.A.

Not only can you feel good knowing that APEX Water Filters gives Americans good-paying jobs, but you can also be certain that we carefully monitor each step in the manufacturing process because we produce our filtration systems locally.

If for any reason you're not completely satisfied with an APEX Water Filter, we'll replace it or refund the purchase price--no questions asked.

Quality Guaranteed

APEX Water Filters guarantees that our systems will meet your water filtration needs.


The AQ-4030 three-stage reverse osmosis system is a step up from our AQ-4020 RO system. The 1-micron filter cartridge protects the reverse osmosis membrane and improves water quality by removing sediment, insoluble iron and other solids that can foul the RO membrane. The 5-micron activated carbon block adds a second layer of protection by removing chlorine, chloramine and organic chemicals. The thin film composite (TFC) reverse osmosis membrane removes algae promoting phosphates and silicates along with nitrates. The pressure gauge indicates when the system is clogged and requires new cartridges. The AQ-4030 greatly improves the water quality in your aquarium by removing contaminants, like silicate and phosphate, that cause algae growth. Your fish and invertebrates are protected from chlorine and chloramine by the high-efficiency activated carbon block cartridge. The quick connect hose fitting makes it easy to hook up the filter to virtually any water supply. Replacement 5-micron sediment filters, 5-micron activated carbon pre-filters and TFC reverse osmosis membranes are available.


  • Three-stage reverse osmosis filtration system
  • Granular activated carbon pre-filter for chlorine removal
  • TFC RO membrane removes up to 98% nitrate and phosphate
  • Assembled with high-quality John Guest fittings for easy cartridge replacement
  • Made and wet-tested in our US facility
  • Pressure gauge to monitor filter system efficiency
  • Made and wet-tested in our US facility
  • Includes 3/4” non-corrosive garden hose connector for easy installation-nothing else to buy!

Warranty * Household water pressure can cause leaks and damage the surrounding building or fixtures if not properly installed. User must check all fittings for tightness. APEX assumes no responsibility for water damage due to leaks.

Options & Upgrades