800G under-sink reverse osmosis system with a mineral stage: what the 800 figure means, and the space and power it needs
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About this product
This is an under-sink reverse osmosis system sold with an 800G rating, and the figure refers to the gallons the membrane can pass in a day rather than to a tank size, so it fills a glass quickly and does not rely on a pressure tank to keep up. The membrane is described as a Dow and DuPont type and the system adds a mineral stage after it, which is the part to ask about if what goes back into the water matters to you. Before ordering, measure the cabinet: an RO unit needs height for the housings, room for the tank if one is included, a drain connection for the waste line and a socket for the pump. Running cost is the part buyers forget, because the pre-filters and the membrane are consumables on different schedules, so ask for the price and the interval of each. What it will not do is work without a drain or a power point, and the exact filtration stages are for the seller to confirm.
Product images
Pros & cons
Pros
- The 800G membrane rating means fast filling without waiting on a small pressure tank
- A mineral stage after the membrane is the reason to pick this over a plain RO unit
- Under-sink format keeps the tap clear and the housings out of sight
- Pre-filters and membrane are standard consumables, so the running cost can be planned
Cons
- Needs a drain connection and a power socket under the sink; neither can be skipped
- Measure cabinet height and depth first, the housings and any tank take real space
- Filter stages, wastewater ratio and the annual cartridge cost are not stated here, ask the seller
