Basket Strainers
A basket strainer sits upstream of a pump and captures debris before it reaches the impeller. It is among the least expensive items in a life support system and prevents some of the most costly failures.
A basket strainer is a coarse debris screen installed on the suction side of a circulation pump in an aquatic life support system; it protects the pump and is sized on open (free) area rather than pipe size.
On pools and water parks the same device is specified as a hair and lint strainer, and on aquaculture systems as a pump suction strainer; the sizing rule is the same in each case.
Where it’s used
Commonly installed ahead of circulation pumps, heat exchangers, instrumentation, and other equipment that could be damaged or fouled by debris.
Why specification matters
Strainers add head loss, and the head loss grows. A clean strainer contributes modest loss. A loaded one contributes considerably more. Pump calculations need to account for the dirty condition, not the clean one, or the system loses flow between cleanings.
Basket area is the specification, not line size. A strainer matched to pipe diameter may have insufficient screen area for the debris load. Open area relative to pipe area, free area ratio, determines how long it runs between cleanings. Undersized strainers get cleaned constantly and eventually get left dirty.
Mesh size is a balance. Fine mesh captures more and clogs faster. Coarse mesh runs longer and passes more through. The right answer depends on debris and on how often staff will realistically service it.
Clear covers are worth the small premium. Being able to see basket condition without breaking the seal means it gets checked. Opaque covers mean strainers get inspected only after a problem.
Access is frequently overlooked. Baskets need pulling. Clearance above the strainer and space to handle a wet, heavy basket has to exist in the room as built.
Suction-side strainers affect NPSH. Loss across a strainer reduces net positive suction head available. A dirty strainer can push a pump into cavitation. This is a common cause of pump damage traced back to a maintenance issue that was really a sizing issue.
How SIVAT helps
We confirm strainers are sized on free area rather than line size, check that head loss is accounted for in the dirty condition, and verify service access exists. We supply strainers alongside the pumps they protect, with matching materials and connections.
Equipment these systems use
Pricing basket strainers on a project?
Send us the plans, specifications, or equipment list. An experienced aquatic equipment specialist will review the project requirements, identify the system needs, and provide clear, competitive pricing.