Under-sink reverse osmosis
HALO Ultra Plus Reverse Osmosis
The HALO Ultra Plus is an under-sink reverse-osmosis system for drinking and cooking water. It reduces a long list of contaminants — including PFAS/PFOS, lead, arsenic, fluoride, hexavalent chromium and total dissolved solids — then adds minerals back so the water is not flat.
Four stages under the sink
Stage one is a 5-micron sediment filter; stage two a 5-micron carbon block that takes out chlorine and organics before the membrane. Stage three is a 50 gallon-per-day RO membrane that removes dissolved contaminants and TDS. Stage four is an alkalinity/pH booster that remineralises the water for better taste.
Filtered water collects in a 4.5-gallon tank and is delivered through a dedicated smart faucet that signals when the filters are due. A HALO leak detector shuts the supply if it senses water where it should not be. HALO rates the system at a 1:1 purified-to-drain ratio, and it needs no electricity.

Maintenance
Filter changes are tool-free and use a single kit (H-RO-PLUS-KIT) with all four stages. Milani sets the schedule based on your water and household use, and can plumb the RO water to a fridge or ice maker as well as the faucet.
- Reduces PFAS, lead, arsenic, fluoride, chromium-6, TDS
- Remineralised — not flat-tasting
- Smart faucet filter indicator + leak detector
- No electricity; tool-free filter changes
How Milani installs and looks after it
Milani installs HALO equipment on the main line where water enters the home (or, for drinking-water and point-of-use units, under the kitchen sink), tests your water first so the system is matched to what you actually have, and sets it up with the correct bypass and shut-offs so future service is simple. Where a unit has replaceable cartridges or media, we tell you the schedule and supply the parts.
At a glance
- Sediment + carbon block pre-filters (5 micron)
- 50 gallon-per-day RO membrane
- Stage 4 alkalinity / pH booster (remineralisation)
- Smart faucet with filter-change indicator + HALO leak detector
- Tool-free filter changes (kit H-RO-PLUS-KIT); 4.5-gal tank
Warranty
The HALO Ultra Plus (model H-RO-PLUS) carries HALO's limited warranty; terms depend on registration and filter maintenance. Milani registers the system at installation.
Talk to Milani about the HALO Ultra Plus Reverse Osmosis
We test your water, size the system to what you actually have, handle the install and shut-offs, and check which rebates apply to your address.
Product information and specifications on this page are reproduced from HALO Water Systems product literature and are provided for homeowner reference.
Milani is an independent installing dealer for HALO Water Systems. HALO®, HALO 5™, H2 ZERO™, HALO ION™, Hydro Point®, Heater Guardian™ and related marks are trademarks of HALO Water Systems and its affiliates. Capacity, efficiency and warranty terms vary by configuration and water conditions — Milani confirms the details for your home after testing your water. This page is not an official HALO Water Systems publication.