Reverse Osmosis
Reverse osmosis (RO) systems produce ultra-pure water (TDS ~0–5 ppm) for freshwater and marine aquariums: an ideal base for mixing marine salt or for precise remineralization. No chlorine, chloramines, or metals → maximum stability and fewer algae.
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How it's made: pre-filters (sediment + carbon block) protect the membrane (50–400 GPD). A deionization (DI) resin module "polishes" the water down to TDS ≈ 0. Useful accessories: TDS meter, pressure gauge, flush valve, and booster pump if pressure is low.
Quick choice: 3 stages (basic), 4 stages (with DI, recommended), 5+ stages (difficult water or chloramines → catalytic carbon). Evaluate GPD (liters/hour), minimum pressure (typ. ≥3 bar), waste/product ratio, and available spare parts.
Proper use: perform the initial flush and discard the first few liters; measure the output TDS; keep the circuit clean and the tubes securely connected. Store the produced water in food-grade containers in the dark; mix/aerate before use.
Typical maintenance*: sediment/carbon every 3–6 months, DI resins when TDS rises, membrane every 2–3 years. (*Varies based on consumption and tap water quality.)
Aquarium notes: with RO, a water conditioner is not needed. For marine aquariums: RO + marine salt for water changes; evaporated top-off water is only RO water. For freshwater aquariums: RO + remineralizing salts (GH+/GH&KH+) according to species.
Tip: size the system based on liters/week and home pressure; add a booster below 3 bar and an in-line TDS meter: easy checks, consistent water, fewer tank problems.
— Advice from the Hobby Pesca & Acquari Team
