Municipal purchasing
Filter Cartridges for Water Treatment Plants
What cartridge filters do in a treatment plant, the formats you will see on a purchase order, and how to ask for a quote by part number.
What a cartridge filter does
A cartridge filter is a replaceable element that sits inside a housing and takes particles, and in some designs chemicals or organic matter, out of the water passing through it. In a treatment plant these elements are often used ahead of other equipment, for example before a reverse osmosis system, so the equipment downstream is protected.
Cartridges are a consumable. They are changed on a schedule or when pressure across the housing rises, so the same part number is usually bought again and again. That is why the part number matters more than almost anything else when you buy.
Common formats
These are the formats you are most likely to see on a purchase order. Each is a different construction, and they are not interchangeable with one another.
- String-wound cartridges: cord wound around a core. Often used for sediment.
- Melt-blown or depth cartridges: a thick, graded layer of fibre for sediment.
- Pleated cartridges: a folded sheet, giving more surface area in the same size.
- Carbon block and granular carbon cartridges: used where chlorine, taste or odor is the concern.
- High-flow cartridges: larger-diameter pleated elements for higher flows.
- Filter bags: a bag that sits in a basket inside a vessel.
- RO membranes: spiral-wound elements, a separate product from the filters above.
How to identify what you buy today
Start with the part number and manufacturer printed on the cartridge, its box, or your last purchase order. If the label is gone, write down the outside diameter, the length, the micron rating, the material, and the make and model of the housing.
Photograph the housing label and the old cartridge. A photo is often enough for us to ask the right question.
What to send for a quote
The more of this you send, the fewer questions come back.
- Manufacturer and exact part number, or the dimensions and rating if you have no number.
- Quantity and unit, for example number of cartridges or cases.
- Delivery address and the date you need it.
- Whether an alternative to the specified product is acceptable, and your rules for judging one.
- Any certification or documentation your specification requires.
- The agency's RFQ reference and submission deadline, if there is one.
How we handle a request
A person reads every request. We check your part number against the manufacturer's published specs and confirm fit with our supplier before you order. If we cannot supply something, we say so plainly.
Availability, lead time, freight and terms are confirmed for the actual request; nothing on this website promises them in advance. This website collects sourcing enquiries. It does not replace your agency's procurement portal or submit a formal bid.
Next steps
Send us one part number. We'll take it from there.
No account, no minimum, no sales call required to get a number. Tell us what you buy today and we'll come back with available options and case pricing on what we can supply.