Yearly maintenance (7-stage device) – the fifth, sixth, and seventh stages

Filter set (fifth, sixth, and seventh stages) for 7-stage water purification device. Made in Vietnam. Price includes installation and tax. Installation included (Riyadh - Qassim). Fifth stage: Activated carbon filter made from coconut shells that compensates for acidity and removes any unpleasant taste or odor after water is stored in the tank. Sixth stage: A set of volcanic rocks and volcanic clay that reduces water surface tension and helps prevent bacteria and algae growth in the water. It contains a calcite unit that supplies water with natural salts the body needs. Seventh stage: A filter containing rocks that help raise water alkalinity pH.