RO & DI System Pricing
Analysis of 728 eBay listings for reverse osmosis and deionization equipment.
What you'll usually pay
👉 In short easy summary
The best value is found in replacement cartridges and valves, which sit 64% and 80% below the market median respectively. Full reverse osmosis units command a premium, pricing 45% above the median.
💚 Best value for your money
Price by type
Why? Prices range from 19.07 for valves to 139.6 for complete units.
Price by brand
Why? Pricing varies from 54.16 for Aqua Medic to 144.68 for SpectraPure.
🛒 Some on sale right now
Common questions
What is the median price for a full Reverse Osmosis Unit?
The median price for a Reverse Osmosis Unit is 139.6.
Are replacement cartridges cheaper than the market average?
Yes, replacement cartridges have a median price of 34.1, which is 64% below the market median.
How does the price of new versus used equipment compare?
The median price for new items is 97.4, while the median for used items is 99.99.
How we got these numbers
Worked out from 200 live eBay listings (price range $16–$220, odd outliers ignored). These are asking prices, so use them as a guide. Last checked July 13, 2026.