Industrial Bag & Cartridge Filtration in Saint John, New Brunswick

Bag and cartridge filtration is the unglamorous stage that keeps the rest of a water system honest. Ahead of an RO skid, it protects membranes worth many times its price. After a clarifier or separator, it catches the carryover that would otherwise become a permit exceedance. In a process loop, it holds product quality steady when the upstream supply wanders. Most plants have a dozen of these duties, which is why most plants have a dozen housings.

Matching the housing to the duty

The equipment itself is straightforward, and the value is in matching it correctly. Single-bag housings handle small sidestreams; multi-bag vessels with up to 12 bags carry full process flows through one shell. Micron ratings run from 1 to 800, from polishing duty to coarse solids knockout, in felt, mesh and specialty media. Cartridge housings cover the finer, lower-flow end of the range. Vessels come in stainless steel for corrosive or sanitary service and carbon steel where the chemistry allows, with sizing driven by flow, viscosity, solids load and the pressure drop your pumps can spare.

When self-cleaning strainers take over

Where solids loads are heavy or continuous, disposable media stop making sense, and self-cleaning and automatic strainers take over. A motorized scraper or backwash cycle clears the element while the unit stays in service, so what would have been a weekly bag change on a grit-laden stream becomes an occasional inspection. On streams like river water intake, scale-laden cooling loops or high-solids process water, the changeover from bags to a self-cleaning strainer usually pays for itself in labour alone.

The consumables reality

The recurring reality of filtration is consumables, and this is where suppliers differ most. We run a consumables program covering filter bags, cartridges, cloth and media, stocked for fast change-outs rather than quoted with a lead time, and we cross-reference existing housings so switching supply does not mean switching hardware. A housing is a decade-long purchase; the bags are a monthly one, and both deserve engineering attention.

What we need to size one

To size a housing or strainer, we need flow rate, target micron rating, and whatever you know about the solids: an analysis if you have one, a description of the process if you do not. A process engineer reviews the selection and returns a sized configuration, budget price and delivery timeline for your facility, anywhere in Canada, with consumables pricing quoted alongside the vessel. Housings are supplied with davit or swing-bolt closures sized so one person can manage a change-out safely, and gasket and basket spares ship with the vessel, because downtime on a filter change is almost always a missing small part.