Filter Mesh

A robotic pool cleaner filter mesh is a porous filtering material used inside a robotic pool cleaner's filter basket, canister or cartridge. It captures leaves, sand, dirt and other debris collected from the pool surfaces while allowing water to pass through.

Unlike traditional suction-side and pressure-side cleaners that rely on the pool's circulation system, robotic pool cleaners use an onboard motor and filtration system. The filter mesh collects debris inside the cleaner, reducing the amount of dirt reaching the pool's main filtration system and potentially reducing the need for backwashing.

How Does Filter Mesh Work?

As a robotic pool cleaner moves across the pool floor and walls, its pump draws water and debris through the suction inlets. The water then passes through the filter mesh, which traps solid particles inside the filter chamber. Filtered water flows back into the pool through the outlet vents.

The process involves three main functions:

• Debris Capture: The mesh traps particles that are too large to pass through its openings, including leaves, insects, twigs, sand and settled dirt.

• Water Flow: Water passes through the filtering material while captured debris remains inside the filter chamber. A clean filter helps maintain adequate water flow and consistent cleaning performance.

• Multi-Stage Filtration: Some robotic pool cleaners use multiple filtration layers, combining coarse mesh for larger debris with finer filter media to capture smaller particles such as dust and fine silt. The exact design varies between models.

Mesh Size and Filtration Performance

Filter mesh performance is commonly described by its micron rating (μm), which indicates the approximate particle size the filter is designed to capture. One micron is equal to one-thousandth of a millimetre. A lower micron rating generally means finer filtration, although actual performance also depends on the filter material and design.

Mesh size and micron rating are related but are not always interchangeable. Mesh specifications may describe the number of openings per inch or the physical size of the openings, while a micron rating refers to the approximate particle size a filter can retain.

Robotic pool cleaner filters generally fall into two categories:

• Coarse or Standard Mesh: With larger openings, coarse mesh is designed to collect leaves, blossoms, twigs, insects and other larger debris. Its relatively open structure allows water to flow through with less resistance, making it suitable for pools with heavy leaf litter, such as those surrounded by eucalyptus trees. However, fine dust and smaller particles may pass through.

• Fine or Ultra-Fine Mesh: With smaller openings or finer filter media, this type captures smaller particles such as fine sand, silt, pollen and dead algae. It helps remove finer debris from the water but can become clogged more quickly, restricting water flow and reducing cleaning performance if heavily loaded with leaves or dirt.

The appropriate filter depends on the type of debris in the pool. A coarse filter is generally better for collecting heavy leaf litter, while a fine filter is more suitable for removing smaller particles during routine cleaning. Always check the manufacturer's filtration specifications before selecting or replacing a filter.

Cleaning and Maintenance

Regular filter maintenance helps maintain water flow, cleaning performance and the service life of the robotic pool cleaner.

1. Empty and Rinse After Each Cycle: Remove the filter basket or cartridge after cleaning. Empty the collected debris and rinse the filter thoroughly with a garden hose to remove loose dirt and sediment. Avoid high-pressure washers, which can damage delicate mesh or filter material.

2. Prevent Debris Build-Up: Rinse the filter before mud, algae and other organic debris dry and become lodged in the mesh. This is particularly important during hot Australian summers when debris can dry quickly.

3. Deep Clean When Needed: Fine particles, oils and mineral deposits can gradually accumulate in the filter material. Follow the manufacturer's cleaning instructions and use a compatible filter cleaner if required. Rinse thoroughly before reinstalling.

4. Inspect for Damage: Check the mesh, seams, plastic frame and seals for tears, holes or signs of wear. Damaged filters can allow debris to bypass the filtration system and potentially reach the pump or impeller.

When to Replace a Filter Mesh

A robotic pool cleaner filter mesh should be replaced when it can no longer filter effectively or has sustained physical damage.

Common signs include:

• Tears or Holes: Damaged mesh allows debris to pass directly into the cleaner's internal components.

• Worn or Stretched Material: The mesh may lose its original structure and become less effective at capturing particles.

• Persistent Blockages: If the filter remains clogged despite proper cleaning, the material may have deteriorated or accumulated deposits that cannot be removed.

• Reduced Filtration Performance: Fine debris repeatedly passes through the filter even when it is clean and correctly installed.

Replacement frequency depends on usage, debris levels and filter condition. Always use a compatible replacement filter designed for the specific robotic pool cleaner model.