Original manufacturer option
iSpring F4 pre-filter and final-carbon set, without membrane
Filter F4
Your search matches the manufacturer’s listed filter identifier.
Before you buy
Replaces three pre-filters and final carbon only. The RO membrane is not included. Choose this only when these stages are due. This is not a complete five-stage change and has no alkaline cartridge or UV lamp.
Why this filter
What’s included
Includes one sediment cartridge, one granular-carbon cartridge, one carbon-block cartridge and one final carbon cartridge.
How this compares
This is a checked replacement, not a Best Overall or Best Value winner yet. Before choosing a winner, we need other filters we can trust, a fair comparison of how they work and how reliable they are, and current prices including shipping.
Filtration tests and details
These records explain which filter results we have checked and what their limits are. The same certification name does not mean two filters work equally well.
What we have verified about filtration
We have not yet verified the exact model's health-related contaminant reductions against a current independent certification listing. Manufacturer claims alone do not establish that this filters better than another option.
View sources
These sources explain the fit, features and filter test results described above. They are not retailer price checks.
Installation and care
Caring for the filters
Follow the exact system’s stage-by-stage service schedule and your water conditions. The package does not set one guaranteed lifespan for every stage.
Where to buy
We haven’t confirmed a current price and availability for this filter. Shopping comparisons are not available yet.