1. Filing a complaint with the distributor from whom you purchased the product.
2. Submitting a complaint to Aquafilter or GSP by the distributor who bought the product from the company.
3. Beginning of consideration of the complaint.

Terms and conditions of sale, page 1&2 :

The Aquafilter makes no representations or warranties, except the case when the goods manufactured by the Aquafilter shall be free from material defects in material and workmanship and the Aquafilter warrants such goods for periods from one (1) year to five (5) years (depending on product line – please check warranties for each product as specify on technical specifications) from the date of shipment to the Customer. If within such period, goods shall be proven to be materially defective to the Aquafilter's reasonable satisfaction, then such defective goods shall be repaired or replaced, at the Aquafilter sole discretion. Such corrections or replacements shall constitute a fulfillment of all liabilities in respect of such goods. The warranty for all goods sold by the Aquafilter but manufactured by others shall be provided by such manufacturer for such goods. The Aquafilter shall take all reasonably commercial efforts (other than the payment of money) to provide the manufacturer's warranty to the Customer. The foregoing warranties are exclusive and are in lieu of all other express and implied warranties whatsoever (either in fact or by operation of law) including but not limited to implied warranties of merchantability and fitness for a particular purpose or otherwise. The Aquafilter is not liable for damage to goods, property or persons arising out of improper installation of such goods, modification, and repair or tampering by anyone other than the Aquafilter or personnel authorized by the Aquafilter for such goods; or utilization of the goods under conditions which exceed specifications for such goods. The parties expressly agree that the limitations of incidental and consequential damages set forth herein are agreed allocations of risk and shall survive the determination of any court of competent jurisdiction that any remedy herein fails of its essential purpose. The warranty does not apply to replacements or operations resulting from normal wear and tear of equipment and cartridges, damage or accidents caused by negligence, lack of supervision or maintenance, and defective use of equipment. Custom work and repairs of equipment are not covered under warranty. the Aquafilter shall have no liability to any person for punitive, indirect, special, incidental, contingent or consequential damages of any description or loss of use, revenue or profits, whether arising out of warranty or other contract, negligence or other sort, or otherwise."

Catalog: XCAT-04-19-EN, last page (04.2019) :
"NOTE - Do not use with water that is microbiologically unsafe or of unknown quality without adequate disinfection before or after the system. - Water filtration systems can help reduce the presence of contaminants. In addition, some water filtration systems can help reduce the presence of microorganisms or other contaminants with potential health effects. - We strongly recommend regularly scheduled maintenance and replacement of the filter cartridge in order for the product to perform properly. - Replace the filter cartridge at least every 6 or 12 months (depending on water quality and water consumption)

LIMITED WARRANTY: Manufacturer warrants that this product is free from defects in materials and workmanship. This warranty, together with any and all warranties implied by law, shall be limited to a period of two (2) years from the date of original purchase. This limited warranty does not apply to failures that result from abuse, misuse, alteration or failure to properly comply with installation, or cartridge change instructions. We strongly recommend adding to all point of use and point of entry a Pressure Limiting Valve or Pressure regulator to guard against unwanted extreme water pressure events such as, but not limited to, pressure increases, surges, and water hammer which could occur in the water pipes. Not having one installed could mean that if you ever did have to claim damage caused by a burst water filter system, the claim will be denied. All Aquafilter images, trademarks, logos, and other intellectual property are the sole and exclusive property of Aquafilter Europe and may not be used without our express written consent."