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4 Stage Undersink Reverse Osmosis Pre+Post Water Filter Replacement Pack (1-11)

In stock
4 Interest Free Payments of $14.13

This is the standard annual replacement pack for the following Undersink Reverse Osmosis systems:

Kit Contains

  • Pre-Filters:
    • 1x 5 Micron Polyspun Sediment Filter
    • 1x 5 Micron Coconut Carbon Filter
  • Post-Filter:
    • 1x Granular Activated Carbon Post Filter (Standard)
    • Upgrade to pH Neutralising 1x Dual Finishing Alkaline Cartridge containing 100% Pure Japanese Coconut Carbon & Calcite Mineral Media

This is a service kit that would be applicable should the membrane NOT require replacing.

Where systems are under the age of 2/3 years it is unlikely that the membrane should require replacing. Therefore this kit will be all that is required to service your 4 stage R/O and some Wall Mount R/O Kits.

All water applications are different, most membranes will last approximately 3-5 years, pending regular replacements of the pre-filtration cartridges. However, on certain waters, membranes can expire between 1-3 years, in which case you should check our eBay store for a replacement pack including the membrane.

How do I know if the Membrane needs replacing?

This can be difficult for the homeowner to decide, but generally, the taste/hardness of the water determines this, to the point where you may be suspicious if the membrane is fully functioning. Another indication is the water flow through the membrane. If your flow rate decreases rapidly this can be another indication of membrane blockage.

If you are in doubt, send us a sample of your pre and post membrane water and we will check it free of charge and advise you if your membrane is still functioning correctly.


More Information
Type Filter Cartridge

Return Policy

Due to the nature of the products we sell, a strict return policy is in place. We work with food grade certified materials that must be un-opened and un-used as to be able to be re-sold.

You may receive a refund or credit of equal amount, less the restocking fee if applicable and any other deductions that are relevant. 

  • Wrongly purchased items may be returned for a merchandise credit, this applies for but not limited to: Wrong size, wrong system etc.
  • 30 Day return Policy:  Returns will not be accepted without prior approval or after 30 days of invoice date.
  • All returns will incur a 17.5% restocking fee or cost to send the item to you whichever greater. FSA may use discretion to determine the restocking fee.
  • Any damages (minor, that can be repaired) will incur a fee which will be deducted from the total refund which will be equal to the cost of the replacement 
    parts (List Price) and labour charge (if applicable) to repair the system(s). This will be separate to the restocking fee.
  • Any damage considered to be major and not feasible for repair may be refused and the return request will be void. The customer will be responsible for the return freight or disposal of the damaged unit.
  • Return shipping is to be paid by the buyer to the address provided. It is recommended that the customer applies transit warranty to the return freight in case of damage.
  • Any damages to the system that were not reported to FSA within 48 business hours of receipted delivery are not covered under our transit warranty.


  • Should the item appear faulty or doesn’t work how described, the unit/item must be returned for testing (if requested), the return postage paid by the buyer. If the unit/item is deemed to be faulty, compensation will be provided for the postage cost (Proof of cost required). If the unit/item is deemed to be in working order and as described, the buyer will responsible for return postage. 


If you have any questions about our return policy, please contact us before purchase. This will also help to ensure you purchase the correct product that suits your requirements.