Waterco Filter Cartridge Buying Guide

How to identify your Waterco® filter cartridge

Check the end cap and tank label. Waterco® housings print the filter model on the tank label, and the cartridge part number is printed on an end cap; either one identifies the replacement you need.
Match the number. Every Excel Filters product page lists the OEM part numbers and housings it replaces, plus the matching Pleatco, Unicel, and Filbur cross-reference numbers. You can also look up any part number on our cross-reference chart.
No legible number? Measure outer diameter, length, and both end caps — our how to measure your filter cartridge guide walks through each dimension.

Have your number? to jump straight to the matching replacement.

Which Waterco® filter system do you have?

Waterco® Trimline Cartridge Filters Designed for residential pool filtration with reliable water cleaning and efficient cartridge performance.
Waterco® Tri-Cartridge Filters Dependable filtration capacity and consistent water flow for select Waterco® systems.
Waterco® MultiCyclone Cartridge Filters Advanced filtration applications that help improve overall efficiency and reduce maintenance requirements.
Waterco® Opal Cartridge Filters Dependable pool filtration performance designed to maintain clean, clear water.

Cleaning and replacing your Waterco® cartridge

Rinse the cartridge with a garden hose every few weeks during swim season, spraying at an angle to flush debris from between the pleats. Deep-clean with a cartridge cleaning solution at least once a season to remove the oils and scale rinsing leaves behind — our care and maintenance guide covers the full routine. Most cartridges last 12 to 24 months: replace yours when cleaning no longer restores water flow, the pleats fray or stay discolored, or an end cap cracks.

Why Choose Excel Filters?

Made in the USA — Premium pool and spa filters manufactured with strict quality standards.
OEM-Level Quality — Designed to meet or exceed OEM specifications for fit, function, and performance.
Expert Support — Our filtration specialists can help you identify the correct replacement cartridge.
Competitive Pricing — High-quality filtration without the premium OEM price tag.

Once you know which cartridge you need, shop Waterco® replacement filter cartridges in singles or money-saving multi-packs — engineered to OEM dimensions, made in the USA, and backed by our Perfect Fit Guarantee on listed cross-references.

Frequently Asked Questions

How do I find the right Waterco® replacement filter cartridge?

Check the OEM part number printed on the end cap of your current cartridge, or measure its diameter, length, and both end caps. Every Excel Filters product page lists the Waterco® and aftermarket part numbers it replaces (Pleatco, Unicel, Filbur), and our how-to-measure guide walks through each dimension step by step.

How often should I replace my Waterco® filter cartridge?

Most pool and spa filter cartridges last 12 to 24 months depending on usage, debris load, and water chemistry. Replace the cartridge when cleaning no longer restores water flow, the pleats fray, or an end cap cracks. Rinsing the cartridge regularly during swim season extends its life.

Are Excel Filters cartridges compatible with Waterco® filter systems?

Yes. Excel Filters replacement cartridges are manufactured in the USA and engineered to meet or exceed OEM specifications for Waterco® systems, with matching dimensions, end caps, and filtration media.

Do Excel Filters replacement cartridges come with a warranty?

Yes. Every Excel Filters cartridge is covered by a 6-month limited warranty against defects in materials and manufacturing, and a 30-day return policy.

How fast is shipping?

Standard shipping is free on all orders within the United States. Orders ship within 1–2 business days and typically arrive within 2–3 business days after that.