4.5" x 20" Big Blue Refillable Water Filter Cartridge - GAC Coconut Shell Carbon + KDF 85: Removes Iron, Sulfur/Rotten Egg Smell

Special Price $79.99 Regular Price $89.99
In stock
  • Made in the USA
  • Save money with this refillable inline filter
  • Highest grade filtration media available
  • Works well with reverse osmosis systems
  • Satisfaction guaranteed


<h2>Whole House Big Blue 20" Filter/Cartridge</h2>
<p>Combination of KDF 85 + Granular Activated Coconut Shell Carbon.</p>
<h2>Removes Iron/Sulfur/Rotten Egg Smell</h2>
<p>Filter Size is 4.5"x20". Fits standard Big Blue Housing</p>


KDF 85 Medium Removes or reduces iron and hydrogen sulfide from municipal or other water supplies. Also controls scale, bacteria and algae.

iron / hydrogen sulfide reduction filter contains a combination of KDF85 media and coconut shell activated carbon. The KDF85 effectively reduces dissolved iron and hydrogen sulfide odor over a wider pH range than possible with standard oxidation filters such as manganese greensand, thereby protecting your plumbing system including toilets, bath tubs and showers, and appliances such as clothes washers and dishwashers, from unsightly staining and odor. The activated carbon removes organic contaminants to substantially improving water clarity, taste, and odor. It does NOT add any harmful chemicals to the water, making it completely safe for drinking water applications.


fraction of the cost of competitive iron removal systems

easy to replace cartridge - no media regeneration necessary!

NO backwashing required!

effective over a wide pH range of 6.5 to 8.5

also removes iron and hydrogen sulfide (rotten egg smell)

does not add harmful bi-products to your drinking water

prevents staining of laundry and plumbing system including you shower and tub

will not harm your septic system

filter features built-in granular activated carbon post-filter for the removal of a wide range of organic contaminants and better tasting water.

filter media inhibits bacteria growth (bacteriostatic)

Application: This system should be employed where low to moderate ferrous (dissolved) iron or hydrogen sulfide contamination is known or expected (hydrogen sulfide produces a distinct rotten egg / sulfur odor). This filter is most effective where iron and hydrogen sulfide levels are less than 5 ppm. Best contaminant removal rates are achieved where the pH is between 6.5 and 8.5 and where the water contains some dissolved oxygen. This filter will also remove ferric iron through mechanical filtration, although a sediment filter may be a more cost effective choice. If your water's pH level is 7.0 or higher, you should consider our PH5 iron / hydrogen sulfide reduction filter which uses a different filter media - the replacement cartridges are significantly cheaper.

The life of the filter cartridge depends on the contamination level (iron, manganese and hydrogen sulfide levels) and amount of water consumed on a daily basis. The expected filter life for a typical residential application is about 20,000 gallons (75,500 L). For best results and longest filter-life, a sediment pre-filter is recommended.

What types of contaminants are you dealing with?

Problem  -  Likely Cause

rusty red or brown staining of fixtures or laundry and/or your water has a metallic taste  -  excess iron

black staining of fixtures or laundry  -  excess manganese

rotten egg smell from water  -  Hydrogen sulfide (H2S)

How it Works: KDF85 media acts as a catalyst to change soluble iron (ferrous) cations into insoluble ferric hydroxide which becomes trapped in the filter. The hydrogen sulfide is converted into an insoluble sulfide precipitate which is then similarly trapped and filtered. Ferric iron is removed by mechnical filtration.

Specifications & Operating Conditions:

Housing Material    Polypropylene

Maximum Recommended Flow Rate    3 Gallons Per Minute (11 LPM)

Recommended Operating Temp. Range:    40-100°F (4.4 to 37°C)

Maximum Recommended Pressure    90 PSI (6.2 bar)

Required pH level:    6.5 to 8.5

Recommended Dissolved Oxygen :    Iron level in ppm x 0.6

Maximum Recommended Iron Level:    5 ppm (mg/l)

More Information
Model Number 4520BK85CGAC
UPC 818368012319
Brand Oceanic Water Systems
Item Number 39
Shipping Length 22
Shipping Width 6
Shipping Height 6
Shipping Weight 8
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