Offline Filtration Units

Proactive Protection for Hydraulic and Lubrication Systems

Offline filtration units are standalone systems designed to remove contaminants from hydraulic and lubrication fluids without interrupting system operation. Installed independently of the main hydraulic circuit, these units continuously clean fluid in a separate loop, helping to maintain optimal cleanliness levels and extend the life of both the fluid and system components.

At Hydraulics Online, we supply offline filtration units from a wide range of global manufacturers – including Argo-Hytos, MP Filtri, and many others – with expert advice to help you select the right solution for your application.

Our website shows only a selection of what we supply. For impartial advice and access to our full range of hydraulic components, contact our expert team.

Off-line filtration unit. For impartial advice and access to our full range of hydraulic components, contact our expert team.

An offline filtration unit (also known as a kidney loop system) draws fluid from a reservoir, filters it through high-efficiency elements, and returns it to the tank. Because it operates independently of the main system flow, it provides continuous filtration regardless of whether the system is running.

This setup offers several key advantages:

Consistent fluid cleanliness – unaffected by system pressure or flow fluctuations
No downtime required – filtration continues even during maintenance or shutdown
Targeted contamination control – ideal for high-value or sensitive systems

Contamination is the leading cause of hydraulic system failure. Offline filtration units help prevent:

Abrasive wear from solid particles
Fluid degradation due to water or oxidation
Valve sticking and pump damage
Reduced system efficiency and lifespan

By removing contaminants at the source, offline units protect your investment and reduce maintenance costs.

Can offline units be used while the main system is running? Yes – that’s one of their key advantages. They operate independently and continuously.

Are mobile filtration units available? Absolutely. We supply portable units ideal for fluid transfer, flushing, and on-site maintenance.

How do I know what filtration rating I need? Our team can help you determine the correct micron rating and filter media based on your fluid type, system sensitivity, and cleanliness targets.