Six-layer purification system Built-in filter element made of coconut shell with activated carbon + zeolite + PVA non-woven fabric + calcium sulfite + obsidian, optimized for hard water. It filters 99% of mud, sand and rust, 98% of residual chlorine and 95% of dyes and odors, in accordance with Dutch drinking water purification standards. Universal adaptation for all scenarios Compatible with taps with a diameter of 1.5-3.2 cm (for one- and two-hole sinks, showers, bathtubs and kitchen faucets) and adapted to common tap specifications in the Netherlands. Tool-free design and easy to maintain The filter element can be directly removed and rinsed with water. The heat-resistant material (-20 C~80 C) increases the cleaning efficiency by 50% in home offices. Quick installation in 30 seconds Tool-free screw design, suitable for standard faucet interface, filter element life up to 6 months (based on an average daily water consumption of 10 liters), manual replacement steps