Reverse osmosis systems · 5 models · 2 series

Culligan RO Replacement Filters

Find compatible filters and manuals by selecting your Culligan system below

Trusted by homeowners and businesses worldwide, Culligan is a leader in the water treatment industry. We offer premium Culligan-compatible reverse osmosis water filters and membranes that fit perfectly into your Culligan under-sink RO system. The reverse osmosis water filters effectively trap chlorine, chloramines, organic contaminants, heavy metals, and assorted impurities to greatly improve the taste and odor of your drinking water. Some filters require a "conversion kit" (see details below).

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Culligan AC Models

3 models

Culligan Aqua-Cleer Models

2 models

FAQ

Commonly Asked Questions about Culligan RO Replacement Filters and Parts

What Culligan systems does ESP Water sell replacement filters for?

ESP Water lists replacement options for the Culligan AC-15 Aqua-Clear, AC-30 Aqua-Clear, AC-50 and LC-50 Aqua-Clear, Aqua-Clear Advanced Drinking Water System, and H-83 Aqua-Clear. Open the page for your exact model before choosing a cartridge or kit.

Are the Culligan replacement filters sold by ESP Water original Culligan parts?

Many of the products are compatible aftermarket replacements from manufacturers such as Omnipure rather than Culligan-branded parts. Each product page identifies the brand, part number, dimensions, and the systems it is intended to fit.

How can I identify which Culligan RO system I have?

Look for the full model name on the manifold, filter head, cabinet, or service label. Compare the number of stages, cartridge style, membrane rating, and tubing connections with the model page; the faucet and storage tank alone usually do not identify the system.

Can I replace a Culligan membrane with a different GPD rating?

Only when the system design supports the new capacity and the membrane is paired with the correct flow restrictor. Match the existing membrane rating, seal configuration, feed pressure, tank, and tubing before changing from 36, 50, or 75 GPD.

Can I replace one Culligan RO filter instead of buying a complete kit?

Yes, when you have identified the exact stage that is due and the replacement is listed for your model. A model-specific kit is more convenient for scheduled service because it groups the routine filters, but check whether the RO membrane is included.

How can I tell whether the Culligan RO membrane needs replacement?

Check product-water TDS, calculated rejection, production rate, and tank refill time after confirming the prefilters and feed pressure are in good condition. Replace the membrane when performance falls outside the target for your system rather than relying only on age.

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