PurePro ERS105 reverse osmosis: a compact 5-stage under-sink water filter with tool-free quick-change cartridges. Optional mineral or alkaline attachment.

The PurePro ERS105 reverse osmosis system is a 5-stage drinking water purifier installed under the kitchen sink on the mains supply. Thanks to its metal frame and compact QUICK CHANGE cartridges, it is much smaller than typical reverse osmosis systems. According to the manufacturer it filters with 95 % efficiency; water quality depends on the feed water, contamination level, temperature, pH and mains pressure.

In the PurePro ERS105 reverse osmosis system, water passes through these stages:
The manufacturer states that the system removes suspended impurities (rust, sand), limescale, chlorine, chemicals, heavy metals, nitrates, arsenic, pharmaceutical and hormone residues, viruses and bacteria. If you want water enriched with minerals, also see the PurePro reverse osmosis with alkaline attachment or the Ecosoft Pure Balance.
| Tank | 12 L, stainless steel with polypropylene inner coating |
| Inlet pressure | 3–7 bar; for lower pressure we recommend the ERS105P model with a pump |
| Capacity | 120–200 L/day (depending on pressure and contamination) |
| Membrane | 50 GPD, pore size 0.0001 µm |
| Fittings | 3/8″ |
| Manufacturer | PurePro USA Corp. |
The kit includes: the 5-stage unit with filter cartridges, a tank, a pure-water tap and 3/8″ installation fittings. Exact dimensions are shown in the product image.
With the PurePro ERS105 reverse osmosis system, you replace cartridges together with their housings, without tools and in one step. Replace stages 1–3 and the post-filter every 6 months (household of 4), at the latest every 12 months with low use. Replace the RO membrane every 24 months, at the latest every 36 months. Cartridge life also depends on feed-water quality. At each change you may optionally disinfect the system, for example with grapefruit seed extract or colloidal silver.
The system has quick-connect fittings and the filter units come pre-installed, except for the RO membrane, which is sterile-packed separately. Install the PurePro ERS105 reverse osmosis system under the sink on the mains supply.

Price and delivery: €319.90 incl. VAT (€262.21 excl. VAT). In stock at the supplier, delivery 3–8 working days. Viewing and pickup at the warehouse by prior arrangement.
The manufacturer gives a 2-year comprehensive warranty on the unit. Regular maintenance is required for the warranty to remain valid. A 10-year water quality guarantee is also stated: with feed water up to 700 mg/L dissolved solids, the outlet water is said to stay below 100 mg/L. The manufacturer lists NSF, CE, WQA and FDA certifications on the page.