The AQ-4020 two-stage reverse osmosis filter is an entry-level RO system suitable for smaller freshwater, marine and reef aquariums. Perfect for nano-reefs! The granular activated carbon pre-filter removes chlorine as well as organic contaminants. The thin film composite (TFC) reverse osmosis membrane removes algae promoting phosphate and nitrate and other contaminants. Your aquarium will be cleaner and require less maintenance with reverse osmosis water. The AQ-4020 is compact and easily fits in tight spaces, allowing for easy installation. The quick connect hose fitting makes it easy to hook up the filter when you need to make water, and then store the filter system when you are finished. Replacement activated carbon pre-filters and TFC reverse osmosis membranes are available.

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.

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.

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

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.

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.