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—Pumps, filtration and plant

Pool circulation and returns

A pool is only as clean as its circulation. Where the returns point and how the water moves decide whether any part sits still.

The pump moves the water, but the returns decide where it goes. If the returns are positioned or aimed poorly, parts of the pool sit still while the water takes the easy route back to the skimmer. Those still areas are where debris collects and where the water is not being turned over.

Equipment guides are about choosing, sizing and installing plant, not about day-to-day pool care.

Circulation is designed with the pool shape and the skimmer position: returns placed and aimed so the water moves across the whole surface toward the skimmer, with no dead corners. It is planned at build, because the return positions are fixed into the shell.

01Summary

What matters most here

  • Where the returns point

    The returns push water across the surface toward the skimmer.

  • Dead spots

    Areas with little flow collect debris and are not turned over.

  • Fixed at build

    Return positions are set into the shell, so they are planned before construction.

02Detail

What circulation design involves

  • Return positions

    Returns placed and aimed so the whole surface moves toward the skimmer.

  • Flow rates

    The pump and pipe sizes matched so the water actually turns over.

  • The skimmer

    Positioned so the surface water and debris are drawn into it.

03Before you start

Before the shell is built

  • Draw the pool shape

    The shape decides where the returns and skimmer should sit.

  • Find the dead spots

    Corners and steps where water would sit still.

  • Match the pump

    Whether the pump and pipe sizes turn the water over properly.

—In practice

How to use this

Plan the returns and the skimmer together, around the pool shape, so the water moves across the whole surface toward the skimmer with no dead corners. The return positions are fixed into the shell, so they are decided before construction. Match the pump and pipe sizes so the water actually turns over.

Mistakes worth avoiding

Returns aimed at each other
Returns aimed the wrong way leave dead spots where debris collects. Aim them across the surface toward the skimmer.
Deciding returns after the shell
Return positions are fixed into the shell. Moving them later means opening the shell, so they are planned at build.

04FAQ

Common questions about this

Why does debris collect in one corner?
That corner is a dead spot where the circulation does not reach. The returns or their aim are usually the reason.
Can circulation be fixed after the pool is built?
Partly, by adjusting the return aim and the pump speed. Moving the returns themselves means opening the shell, which is why they are planned at build.
How do I know the circulation is right?
The water should move across the whole surface toward the skimmer, with no still areas. A pool that stays clear everywhere is the proof.

05Read next

More pool guides on this

Filed under pump & filtration systems. Every pool guide is listed on the pool guides page.

—NEXT

Planning a new pool?

Tell us the shape and where the skimmer will sit. We will plan the returns so the whole pool moves.

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