Filteroo 5.5” Rain & City Water Gravity Carbon Block Filter Cartridge



Filteroo 5.5” Rain & City Water Gravity Carbon Block Filter Cartridge

Quality water filtration with the minerals Retained

This is a carbon block cartridge suitable to be used in any gravity water filter it will fit inside. It is 140mm high x 60mm wide in diameter. It is the perfect solution for any Filteroo Blue or Filteroo Ceramic gravity water filter which is used to filter rain water from a water tank or treated city tap water.

It is a great choice with a standard 12.5mm threaded end to install into any gravity water filter so long as the gravity water filter top tank has a minimum hole size of 12.5mm or a maximum hole size around 20mm. (Note: You can drill or file the hole in your water filter top tank to be 12.5mm if required.)

It flows at a much faster flow rate than the ceramic gravity candles, it has fantastic test results and creates contaminant free healthy tasty water.

If you are filtering rain water, it is great as it will stop all the bugs & bacteria in the water, whilst at the same time it protects you from any herbicides, pesticides or lead that may wash in from your roof. You will hear people say how lovely their rain water is, but rain water tastes even better once it has filtered through a good big block of carbon like this.

Then for treated city water, you have the same great protection from bugs & bacteria, it has super high removal rates for the common contaminants like chlorine & chlorine by-products, plus it will protect you from any herbicides & pesticides or heavy metals that may be in the water.

This Filteroo rain & city water carbon block gravity water filtration cartridge is made from the highest quality carbon. It combines mechanical filtration and physical adsorption processes to reduce a wide variety of drinking water contaminants of both aesthetic and health concerns.

This cartridge has a smooth outer shell compressed to repel any sediments, cysts, bugs or bacteria. The pore structure of the carbon enables sufficient contact time for this cartridge to be ideally suited to improving taste and odour.

You will be battling to find a better carbon block gravity cartridge than this, that’s a fact..

What Makes This Product Unique

It is the quality of the carbon used to create the carbon block cartridge and the professional manner in which they are manufactured which has passed all the tests at such high removal rates that makes this cartridge so unique. As the water passes through this cartridge slowly, the contact time with the cartridge allows for such a wide range of contaminant removal. Manufactured for Filteroo Australia who guarantee high-quality materials are always used. This single carbon block gravity cartridge is a highly efficient filter suitable to remove unwanted contaminants from any water supply. It is great for both rain water or chemically treated city water.

If you would like to remove Fluoride as well, you will need to use the Ultraceram ceramic/carbon gravity cartridge with Fluoride removal capabilities for the Filteroo Blue or Filteroo Ceramic purifiers..

Operating Performance

Working parameters

Working ph range 5.5 - 9.5

Nominal Flow Rate



To guarantee performance replace every 2200 Litres or every 12 months when water flow becomes to slow, whichever comes first.


  • Height 140mm
  • Diameter 60mm
  • Hole diameter 12.5mm minimum to 20mm maximum

Long-Lasting Service Life Of 12 Months

Cartridges are very easy to replace and only have to be changed over as required, or every 12 months, whichever comes first. They have a recommended maximum life of 2200 litres.

Due to the filtration of particulate & sediments from the water during use, the flow of water from the filter may reduce over a period of time.

If your cartridge water flow rate slows down it is normally only because the outside of the cartridge has blocked with fine sediments. These sediments do build up and can slow the flow rate over time dependant on the volume of sediments in the water supply used to fill the top tank.

To restore the water flow to its normal level, simply remove the cartridge and follow the backwashing instructions to backflush the cartridge and push sediments back out of the cartridge.

If after backwashing the water flow is still slow, you can also get some 100 grit sandpaper or a new Skotchbrite scour pad & scrub the outside of the cartridge under a flowing tap, ensuring that the open-ended thread does not contact the water to avoid contamination. Scrub harshly as this cartridge is quite thick & can be scrubbed clean many times.

Cleanliness is important, wash your hands before handling the cartridge and take care to ensure that no contamination of the cartridge occurs during cleaning. Use a glove or similar so your hands don't touch the cartridge as much as possible.


If the filter is left to stand for more than 3 - 4 days without use, it is recommended that one litre of water be allowed to flow through the cartridge to waste before using.

Test Results


5.5" Silver Impregnated Carbon Block with Lead Removal Treatment

OD x L(mm)

60 x 140

Chlorine Removal


Bacteria Removal


Virus Removal


Lead pH 6.5 @150ppb (NSF 53)




Product Specifications

  • The carbon cartridge is 140mm (5.5”) in height & 60mm in diameter.
  • The cartridge threaded stem that holds the cartridge into place is 12.5mm in diameter and 34mm in length
  • The cartridge threaded stem length with the washer on is 30mm
  • Weight is approximately 300 grams
  • Life Span: 2200 litres or 12 months whichever comes first

  • How to Prime the 5.5” Filteroo Rain & City Water Gravity Carbon Block Filter Cartridge


    How to Install & Flush 5.5” Filteroo Rain & City Water Gravity Carbon Block Filter Cartridge

    When installing or replacing any water filtration cartridges, ensure you know what you are doing or have a qualified person to help you or contact us for assistance. Please find paper instructions inside every cartridge box.

    • Cleanliness is important. Wash hands before handling the cartridge and take care to ensure that no contamination of the cartridge occurs during assembly.
    • Pre prime the cartridge as instructed in the priming instructions..
    • Use a glove or similar so your hands don't touch the cartridge as much as possible.
    • Remove the locking nut & leave the sealing washer over the threaded stem.
    • Place the filter candle thread through the hole in the upper section of the top housing from the inside out and secure it with the wing nut.
    • Do not overtighten.
    • Ensure that the outlet tap is in the off position.
    • Fill the upper chamber with cold water and allow this to filter down through to the lower section.
    • It is recommended that this first supply of filtered water is thrown away, as it may contain material washed from the filter element.
    • Some black carbon fines may be seen when first using but this is harmless & will stop fast.
    • Fill the upper chamber again, open the outlet tap and allow this water to run to waste again.
    • We recommend flowing at least 12 litres of water through the cartridge to waste until it is tasty and flowing clear.
    • If you are using the mineral pad, rinse that under water for 5 seconds to remove any media fines & sit the pad on the inside base of your Filteroo.

    The filter is now ready for use.

    How to Backwash the 5.5” Filteroo Rain & City Water Gravity Carbon Block Filter Cartridge

    Fully Disposable Cartridges

    You can break up the old cartridges with a hammer into small pieces and put the crushed carbon into the garden, then place the plastic end caps into the recycling bin. Or, simply wrap your worn-out cartridges up in old newspaper and place them into your rubbish bin.

    Automatic Cartridge Replacement Service

    When you invest in a water filtration product from Filteroo, we like to ensure you have the best experience possible. We like to lend a hand & take care of you as best we can.

    • We happily monitor the cartridge life for you
    • When the cartridge is due for renewal, we then contact you
    • Once confirmed, we arrange everything and have a new replacement cartridge delivered to your door.