Filters

Choose replacement filters and DI resin for your WaterFed® system

Match replacement filters to your pure water system, its filtration stages, and the water you use. Compare sediment and carbon filters, RO membranes, DI cartridges, and loose resin by their intended role and exact system compatibility. A similar-looking cartridge is not enough to establish a fit.

Buying guide: filtration stages, replacement cartridges, and DI resin

What does each filter stage do?

Sediment filters collect particles, while carbon stages handle chlorine. A reverse-osmosis membrane reduces dissolved minerals before final deionization. DI resin removes remaining dissolved ions. Follow the system’s specified stage order and replacement requirements; one stage does not replace the others.

How do I find the right replacement cartridge?

Start with the system brand, model, and version, then identify the filter part number and stage. Confirm dimensions, seals, connections, and installation requirements against the manual. The replacement DI cartridge for Titan is listed for the Triple Crown Titan and other named systems. Check the complete compatibility list against your equipment before ordering.

Should I buy loose DI resin or a replacement DI cartridge?

Use loose resin only in a vessel or cartridge designed to be refilled. A replacement cartridge is the appropriate choice where the system specifies a complete cartridge change. 60/40 Virgin High Grade DI Resin is sold in a one-cubic-foot quantity; confirm your vessel’s required resin type and fill amount rather than assuming the whole package belongs in one housing.

When should I replace filters or resin?

Follow the model’s service schedule and check water quality at the recommended test points. Source-water mineral content and water use affect DI resin life, so a calendar interval alone is not enough. Browse WaterFed® TDS meters to monitor total dissolved solids, and use the manufacturer’s replacement threshold. A TDS reading does not replace scheduled sediment or carbon maintenance.

Does a higher final TDS reading always mean the RO membrane needs replacing?

No. Final-water TDS alone does not identify the failing stage. Check source water, RO output where the system permits, and final DI output using the manufacturer’s procedure. Exhausted DI resin, overdue servicing, or an installation problem can require different remedies. Use the DI versus RO/DI cart guide to understand the system types, then troubleshoot with your model-specific manual.

What should I check before ordering and installing replacements?

Confirm whether the listing supplies one filter, a complete set, or bulk media. Match every stage separately and check whether seals or other service parts are included. Follow instructions for shutting down and depressurizing the system, fitting replacements, flushing, and checking for leaks before returning it to use. Follow the manufacturer’s storage guidance for spare resin and membranes.

Need help identifying your replacement filters? Call abc at 1-800-989-4003 with your system model, filter part numbers, and water readings.