APEX RF-5050 Replacement Filter Set for Reverse Osmosis Systems(5 Pack)


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Sku: RF-5050
  • All-in-one Replacement Filter 5-Pack takes the guesswork out of selecting the right replacement reverse osmosis filter cartridges
  • Money-saving kit is more economical than purchasing individual replacement cartridges
  • Includes everything needed to easily service your reverse osmosis filter system
  • Includes one 5-micron sediment prefilter replacement cartridge that removes sediment, sand, iron particles and insect parts while protecting the RO filter system from clogging
  • Two 10 solid block activated carbon cartridges that remove chlorine, chloramine, bad tastes, odors, industrial chemicals, VOCs and other groundwater contaminants
  • Comes with a genuine APEX 50 gallon-per-day thin film composite (TFC) RO membrane for removal of salts, nitrate, hydrogen sulfide, and heavy metals like lead and arsenic
  • One granular activated carbon (GAC) polishing filter that makes tap water fresh and sparkling clear
  • All cartridges are genuine US-made APEX components guaranteed to fit properly and provide trouble-free service



RF-5050 Replacement Filter 5 Pack for Reverse Osmosis Systems

Maintaining your RO filtration system is essential for ensuring your drinking water is safe, clean and fresh-tasting. The RF-5050 Replacement Filter Pack contains everything you need to easily and economically maintain your reverse osmosis filter system. No matter if your RO filter system is at home, the office or in a commercial application, the cartridges require periodic replacement to keep the filtration system working properly. If the filter cartridges are not replaced on time, water quality declines, contaminants enter your drinking water and your health is put at risk. The RF-5050 kit contains one 5-Micron Sediment Prefilter () to remove sediment, rust and other microscopic debris while also protecting the activated carbon cartridges and RO membrane. When the polypropylene prefilter begins to fill up with trapped sediment, water flow will decrease. This reduces the amount of water your RO filtration system can produce each day. Replacing the 5-Micron Sediment Pre Filter every 6 months is recommended to keep your RO system working at peak performance.

The RF-5050 replacement Filter 5-Pack also provides two solid block activated carbon filter cartridges. Over time the adsorptive capacity of the activated carbon cartridges decline. The microscopic pores of the activated carbon block become saturated with contaminants. When this happens, the activated carbon can no longer efficiently remove chemicals from your drinking water. Tastes, odors and chemical contaminants will begin to pass through the filter system. The APEX solid block carbon cartridges contain super-adsorptive coconut shell activated carbon for exceptional removal of organic contaminates like MTBE from gasoline spills, solvents, pesticides, chlorine, chloramine and naturally-occurring musty tastes and odors. APEX high-grade activated carbon cartridges remove more contaminants than other carbon cartridges. Unlike low-grade replacement carbon cartridges, APEX carbon cartridges wont release black carbon fines which can clog the RO membrane. We recommend replacing the cartridges no less than once a year to guarantee safe, pure drinking water.

The RF-5050 Replacement Filter 5-Pack contains an exact-fit 50 gallon-per-day reverse osmosis membrane. RO membranes remove total dissolved solids (TDS), sodium, water hardness minerals and heavy metals like aluminum and lead. Reverse osmosis membranes operate under high pressure, squeezing the contaminants out of your tap water. Mineral deposits and traces of chlorine eventually degrade the RO membrane. This reduces the efficiency and effectiveness of the filtration system. Periodic replacement of the APEX TFC membrane ensures clean, safe water day after day. This is especially important to prolong the life of coffee makers, commercial food steam trays, dental equipment, laboratory autoclaves and other equipment that is damaged by mineral scale build-up. We recommend replacing the reverse osmosis membrane every two years to maintain consistently fresh, purified water at all times.

The RF-5050 Replacement Filter 5-Pack also includes one granular activated carbon polishing filter. This powerful filter catches any trace of taste and odor-causing chemicals and gasses so every gallon of water looks and tastes great. The easy to use slip-fittings make it simple to replace this important filter component. Replace the polishing filter every one to two years.

Enjoy Crisp Clean Refreshing Drinking Water for Your Healthy Lifestyle.

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

At APEX Water Filters, we believe that the best water filters start with the best materials. That’s why we only use carbon that is certified by the National Safety Foundation and components that are approved by the U.S. Food and Drug Administration.

Before a water filtration system leaves our facility, we test it to ensure that it meets our high quality standards. This extra step ensures that you receive a filtration system in the best possible condition.

Plumbing Support Recomended

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.

Reverse Osmosis

Questions & Answers

Filter Cartridge

Replacement Schedule



  • Configuration
  • Feed Water Source***
  • Single Pass
  • City or Wall Water*


  • Input
  • Output
  • Pressure Guages
  • UV Lamp
  • 1/2″ or 3/8″ FNPT
  • 1/4″ Tube
  • Optional (Not Included)
  • Optional (Not Included)


  • Radial Flow sediment
  • Radial Flow Carbon
  • Membrane
  • Axial Flow GAC
  • 1
  • 2
  • 1
  • 1

System Dimensions

  • L x W x H Inch (cm) = 19 x 14 x 6(48x 36 x 15)
  • Weight lb.(kg) = 17.5(7.9)

Tank Dimensions

  • L x W x H Inch (cm) = 11 x 11 x 15(28 x 28 x 38)
  • Weight lb.(kg) = 7.5(3.4)
  • * UV ray bacteria disinfection highly recommended for well water
  • ** Does not include operating space requirements.
  • *** Treatment ability of the system is dependent on feed water quality.Performance
    projections must be run for each installation.
  • Installation
  • Contaminant Reduction
  • Tubing Diagram

Operating Limits

  • Maximum Feed Temperature = 85 ( 29.00 )
  • MinimumFeed Temperature = 40 ( 4.44 )
  • Maximum Ambient Temperature = 120 ( 48.89 )
  • Minimum Ambient Temperature = 40 ( 4.44 )
  • Maximum Feed Pressure psi = 85 ( 5.86 )
  • Minimum Feed Pressure psi = 45 ( 3.10 )
  • Maximum Turbidit NTU = 1
  • Maximum SDI Rating SDI = <3
  • Maximum Free Chlorine ppm = 0
  • Maximum TDS ppm = <2000
  • Maximum Hardness gpg+++ = 0
  • Maximum pH (Continuous) = 11
  • Minimum pH (Continuous) = 5
  • Maximum pH (Cleaning 30 Min.) = 12
  • Minimum pH (Cleaning 30 Min.) = 2
  • Test Parameters: 550 TDS Filtered (5 micron), De-Chlorine, Municipal Feed Water, 65 psi (4.50 bar) Feed Pressure, 77 Degrees F(25 Degress C), 7.0 pH. Data taken after 60 minutes of operation.
  • + Low temperatures and high feed water TDS levels will significantly affect system production capabilities. Computer projections should be run for individual applications.
  • ++ Scale prevention measures must be taken.
  • AWater supply adapter valve
  • BCold water shut-off valve
  • CAuxiliary faucet
  • DGarbage disposal
  • EPre-carbon filter sumps
  • FDrain Saddle
  • GStorage tank with valve in open Position
  • HPre-filter sump
  • IMembrane assembly
  • JPost-filter
Weight 6 lbs
Dimensions 16 × 15 × 3 in

APEX RF-5050 Replacement Filter for Reverse Osmosis Systems(5 Pack)

  • Sediment Pre Filter
  • 5 Micron Sediment Pre Filter, RF-1000 to to extract suspended materials such as sediment, rust, insects, and other particles.
  • TFC Membrane
  • The high- rejection (up to 95%) TFC (Thin-Film composite) 50 GPD membrane to reject a wide range of total dissolved solids (TDS).
  • The product water is storage tank, while the reject water (drain) is automatically flushed down the drain.
  • 2 x Carbon Block Cartridge
  • 2x 5 Micron Carbon Block Cartridges, RF-1010 reduces chloramines- the by-product of chlorine and ammonia used in water disinfection. Reduces organic chemicals: pharmaceuticals, herbicides, pesticides, volatile organic chemicals, MTBE , disinfectant by-products and other chemicals for improved taste and elimination of odors. The double carbon briquettes filter out organic matter from water without release of carbon fines. The carbon block prepares water to enter the reverse osmosis element.
  • Polishing In Line Filter
  • In line GAC filter, RF-1001 to remove dissolved gases, bad taste and odor from product water. This is the final polishing stage before consumption.


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