High Flow vs Low Flow Pool Cleaners

What "high flow" and "low flow" mean on a listing

Flow on a pool cleaner listing is the volume of water the cleaner is designed to move, usually stated in gallons per minute or gallons per hour. The figure is a stated detail from the seller or maker. This site compares cleaners on stated details and cannot confirm how a cleaner performs in a particular pool.

A title that says "high flow" tells you the maker designed the cleaner around a pump, motor, or system that moves more water. A title that says "low flow" tells you the maker designed it for a system that moves less water. Neither word is a promise about your pool; both are directions to read the stated flow figure and the maker's page.

• the volume of water the maker states the cleaner moves in a minute or an hour
• the pump flow a suction-side cleaner is designed around, shown as a range or a single figure
• the type of cleaner, since flow is stated differently for robotic, suction-side, and pressure-side models

How flow reaches each cleaner type

A suction-side cleaner is driven by the water the pool pump draws from the pool. The pump's flow is therefore the flow the cleaner moves. The ENERGY STAR page on pool pumps notes that filtration requires only half the flow rate of running a pool cleaner, which is why a pump that runs a suction-side cleaner is often set at a higher speed during cleaning. The listing for a suction-side cleaner often states the flow range the maker designed it for; read that range next to your pump's stated output on the maker's page. The flow difference between suction-side and pressure-side cleaners article compares these two types.

A pressure-side cleaner is driven by water returning to the pool, and some models use a booster pump that the listing names when it is required. Adding a booster pump is pool plumbing work; the maker's manual and a pool professional are where to learn whether your pool's equipment can take one.

A robotic cleaner is powered by low-voltage electricity and does not use the pool pump's flow, as the ENERGY STAR page explains. A robotic listing may still state a flow or suction figure, but that figure describes the cleaner's own motor, not your pump. Cordless robotic cleaners remove the pump flow question from the buying decision entirely.

The pool pump's role in flow

For a suction-side cleaner, your pool pump is the source of flow. ENERGY STAR explains that a conventional single-speed pump is set to the higher speed a pool cleaner needs, and that filtration only requires half that flow. A variable-speed pump can be programmed to run at different speeds, so a pool owner can run it at the cleaner's speed during cleaning and at a lower speed for filtration.

This is why suction-side cleaner listings often pair a flow figure with a pump-related term such as "skimmer" or "suction line." Those words are the maker's stated details about how the cleaner connects. Read them on the listing and confirm them on the maker's page, next to the pump's own stated output. The pump requirements in horsepower article reads a pump listing the same way.

Reading flow figures on a listing

Flow figures appear in the title or the bullet list of a listing. Units matter: gallons per minute and gallons per hour describe different scales, so compare figures only after checking the unit. A range is the maker's stated operating window. A single figure is usually the maker's stated maximum.

When a listing states no flow figure, that detail is simply not stated by the seller. Read the maker's page for the same model. A title that says "high flow" without a number is still a stated detail, but the number is the detail to find next. The flow rate limits for pool cleaners article explains how a stated limit reads on a listing.

Matching flow to your pool setup

The shopping question is not which flow is better in general, but which flow your pool's system can supply. A small filter pump supplies less flow than a large pump. A variable-speed pump supplies a range of flow settings. A suction-side cleaner's stated flow range is the detail to read before you choose; the maker's page is where that figure is confirmed. The required flow rate for suction-side cleaners article explains what a flow figure means next to a pump.

A robotic cleaner sets the pump flow question aside, since it is powered on its own. That is why readers who want no hose on the deck or who do not want to run the pool pump for cleaning often turn to the robotic and cordless buying guides. Readers who already have a pool pump and want a cleaner driven by it can compare suction-side cleaners by their stated flow details.

What to read before you buy

Pool equipment standards are developed by organizations such as the Pool & Hot Tub Alliance, whose standards pages are a reference for how pool equipment is designed and maintained. Use the following checklist when a listing uses flow words.

• Read the type word in the title: robotic, suction-side, or pressure-side.
• Read the flow unit: gallons per minute or gallons per hour.
• Read whether the flow figure is a range or a single maximum figure.
• Read the maker's page for the same model to confirm the flow detail.
• Read the pump's stated output on the pump's own page when you choose a suction-side cleaner.

What to pick for your situation

Questions

Does "high flow" mean a cleaner cleans better?

"High flow" is a stated detail on the listing, not a result the site can confirm. Read it as the seller's claim about the water the cleaner is designed to move, and read the maker's page next to it.

Do robotic cleaners need a high-flow pool pump?

No. Robotic cleaners are powered by low-voltage electricity and do not use the pool pump's flow, as the ENERGY STAR page explains. Their flow figures, when stated, describe the cleaner's own motor.

What units are used for flow figures on listings?

Listings usually state gallons per minute or gallons per hour. Read the unit before comparing two models, since the two scales describe very different amounts of water.

Your listing states no flow figure. What does that mean?

The seller did not state that detail. The maker's page for the same model is where the flow figure is usually given.

Is a booster pump the same as high flow?

No. A booster pump is a separate pump that some pressure-side cleaners use, and a listing names it when it is required. Adding one is pool plumbing work; the maker's manual and a pool professional are where to learn whether your pool can take it.