An under-sink RO quote should include more than the filter assembly. Faucet drilling, drain connection, cabinet access and an optional refrigerator line can change the installed total.
Compare the first-year price and the recurring filter schedule before deciding whether a system is genuinely economical.
Equipment choices that affect price
Tank-based systems are common and economical, while tankless units may add pumps, electronics and higher production capacity. More stages do not automatically mean better performance.
Compare exact reduction claims, daily production, efficiency and replacement availability.
Installation variables
A standard installation needs a cold-water feed, drain connection and dedicated faucet. Granite, quartz or other counters require the correct drilling method.
A refrigerator connection adds tubing, routing and pressure considerations and should be listed separately.
Ongoing filter and membrane cost
Prefilters protect the membrane and are replaced more frequently. Membrane life varies with water conditions, usage and maintenance.
Ask for current replacement pricing and whether filters are proprietary before purchasing.
RO compared with bottled water
Estimate annual bottled-water purchases, delivery, storage and disposal. Then compare them with installation and several years of filter service.
RO often improves convenience, but only when the household maintains it on schedule.
Common questions
Frequently asked questions
Does the RO price include a faucet?
It should be stated clearly. Confirm faucet finish, countertop drilling and whether an existing hole can be used.
Can RO connect to my refrigerator?
Often, but distance, routing, pressure and refrigerator compatibility must be checked.
How often are RO filters replaced?
Intervals vary by model, water conditions and use. Follow the manufacturer’s schedule and monitor performance.