Routine maintenance and cleaning
Maintaining an overflow pool’s balance tank
Overflow pools have a hidden second body of water — the balance tank — that needs as much attention as the pool itself.
In an overflow or deck-level pool, water spills over the edge into a gutter and drains to a balance tank, from which the pump draws it for filtration before returning it to the pool. The tank absorbs the water displaced by swimmers and holds the system’s reserve. If its level is wrong, the pump can run dry or the tank can overflow.
Routine guides describe one part of regular pool care and how to do it properly.
Balance tanks collect debris that passes through the gutter grilles, and their auto top-up valves and level sensors need checking. Gutters and grilles need regular cleaning to keep the overflow even and stop algae growing in the channel.
The short version
A hidden reservoir
The tank feeds the pump and absorbs displaced water.
Levels matter
Too low starves the pump; too high overflows.
Gutters need cleaning
Grilles and channels collect debris and algae.
Maintenance tasks
Tank inspection
Checking level, debris and the condition of float valves and sensors.
Gutter cleaning
Lifting and cleaning grilles and brushing the channel.
Top-up systems
Ensuring the auto fill responds correctly and does not run constantly.
Chemistry across both bodies of water
Testing is done on water that has circulated through the tank, and dosing accounts for the extra volume the tank holds.
Owner checks
- 01
Even overflow
Water should spill evenly along the edge.
- 02
Tank level
Within the marked range, if visible.
- 03
Constant top-up noise
May indicate a valve problem.
Common questions
Why does the pool not overflow evenly?
Blocked grilles, an uneven edge or level issues can cause uneven flow.
Can the balance tank grow algae?
Yes, if not cleaned and chlorinated properly.
Does an overflow pool need more maintenance?
It has extra components that need regular attention.
Where should chemicals be added in an overflow pool?
Wherever the system was designed for dosing — often the balance tank or a dosing point — so they mix before returning to the pool.
Related pool care guides
- Cleaning an infinity edge and its troughA routine task that prevents the same trouble.
- What happens on a pool maintenance visitA routine task that prevents the same trouble.
- Practical safety checks for a home poolAnother decision worth settling at the same time.
- Checking the pool before buying a villaAnother decision worth settling at the same time.
This guide sits under pool maintenance. Browse all pool care guides. We look after pools at homes and commercial properties across Dubai.
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