iSpring RO5004F Reverse Osmosis Water Filter with UV, SGS Tested PFAS and TDS Reduction, 500 GPD RO System Under Sink, 2:1 Pure to Drain, Tankless RO Water Filtration System, Filter Life Monitor, RO+UV

iSpring RO500-4F Reverse Osmosis System With UV: Deep Filtration Plus Sterilisation

The iSpring RO500-4F is a tankless under-sink reverse osmosis water filter that adds a UV sterilisation stage on top of deep RO filtration - SGS-tested for PFAS and TDS reduction. With a high 500 GPD flow, tankless on-demand design, and the extra UV step for microbiological protection, it targets a wide range of contaminants for genuinely clean drinking water. From iSpring, a well-established water-filtration brand, it's a thorough system for households that want both chemical and microbial peace of mind. If you want RO purity plus UV sterilisation in one compact under-sink unit, the RO500-4F is a strong choice.

Key Highlights

• RO + UV: reverse osmosis filtration plus a UV stage for microbiological sterilisation.
• SGS-tested: independently tested for PFAS and TDS reduction.
• Tankless 500 GPD: fast, on-demand pure water with no bulky storage tank.
• Trusted brand: from iSpring, a well-established name in home water filtration.

Who It's For

This system suits households that want the deepest filtration plus the reassurance of UV sterilisation - particularly useful where microbiological safety is a concern. The tankless design saves under-sink space and delivers fresh water on demand, while SGS testing for PFAS and TDS backs up its contaminant-reduction claims. It's ideal for anyone serious about drinking-water quality who wants both RO and UV in one unit.

What to Consider Before Buying

• Installation: it's an under-sink system - manageable for many DIYers, but confirm your space and plumbing.
• Filters & UV: RO filters and the UV lamp need periodic replacement - factor in ongoing costs.
• Water pressure: ensure your supply suits a tankless RO system for the rated flow.
• Power: the UV stage and tankless pump need a power connection under the sink.

Price and Value

A tankless RO system with an added UV stage and independent PFAS/TDS testing delivers pure, sterilised water for years - saving on bottled water and adding microbial peace of mind. iSpring's established reputation backs the value. Prices and availability change on Amazon, so check the current price and any deal before buying to get the best value this August 2026.

iSpring RO500-4F FAQs

• What does the UV stage do? It adds microbiological sterilisation on top of the RO filtration for extra safety.
• Is it tested for PFAS? Yes - it's SGS-tested for PFAS and TDS reduction.
• Does it need a storage tank? No - it's a tankless design delivering fresh water on demand and saving space.
• Do the filters and lamp need replacing? Yes - RO filters and the UV lamp need periodic replacement; factor in the ongoing cost.