RO3 aquarium filter, 75 GPD + demi

This RO3 kit is built for aquarists who fill tanks from a municipal supply and want to reduce dissolved substances before the water goes in. It combines two pre-filters with a 75 GPD reverse osmosis membrane, so the water entering the aquarium is cleaner and softer than tap water.

Why it matters

• Reduced dissolved load: according to the manufacturer, the filter removes 95–98% of organic and inorganic substances dissolved in tap water, including nitrates, nitrites and chlorine.
• No chemical reagents: treatment relies on filtration only, so no additives are introduced into the water.
• Less algae and diatom fuel: by limiting compounds that promote diatom and algae growth, the filter helps prevent nutrient-driven water deterioration in the tank.
• Fast, tool-light installation: all components are included, and the fittings are original quick-connectors secured with locking clips. Filter cartridges can be replaced without removing the fittings, and the manufacturer estimates assembly at about 15 minutes.

Specifications

• Model: RO3 + DEMI
• EAN: 5903900045575
• Weight: 2 kg
• Membrane capacity: 75 GPD
• Pre-filters: sediment WPL2 and carbon WWL2
• Flow restrictor included
• Hose length: 3 m
• Brass water inlet valve and drain clamp included
• Manual in Polish

What it works with

The filter is designed for freshwater and marine aquariums, and the manufacturer also lists household and laboratory use. It is a suitable source of purified water for tanks where tap water quality is a limiting factor. Pair it with a drain connection and a standard tap, as the kit includes the valve, hose and mounting parts needed for that setup.