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How a Skimmer Diverter Valve Helps Direct Waterflow in Your Pool
A skimmer diverter valve can help balance pool water flow, guide debris toward the skimmer, and reduce dead spots when your circulation setup is working properly.
Archive date: this article was written for PoolSkimmer on Oct 7, 2026 and given the earlier archive date of Feb 7, 2026 so the blog reads as an organized archive. It was not published on that date.
The Function of a Skimmer Diverter Valve
By its nature, a skimmer diverter valve is a modest piece of pool hardware. Whether it is located in the plumbing or within the skimmer itself, its job is to steer the water flow. In doing so, it can determine how much water is drawn from the skimmer as opposed to the main drain and in turn affect the way debris is handled on the surface.
The takeaway for any new pool owner should be straightforward: while the diverter is useful for guiding flow, it is no substitute for a sound pump, good filtration or an empty skimmer basket. Should there be an issue with the valve setup or the pump, this small part will not remedy it.
The Importance of Water Flow
A well balanced pool is one where the water does its work. Proper flow serves to:
- Bring floating matter like pollen and leaves in to the skimmer
- Eliminate the dead spots you might find behind ladders or in corners
- Ensure the spa and pool have adequate circulation
- Allow the skimmer and main drain to complement rather than compete with one another
In certain systems the position of the valve will dictate how the pump load is shared between the lower and surface water. If the water is drifting away from the skimmer, a diverter can put things right.
Where the Diverter Is of Most Use
This valve is at its best when the remainder of the system is in order. One might make use of it to fine tune the balance between the skimmer and drain, or if wind is having a habit of pushing debris out of reach of the opening. It is also handy if the skimmer is drawing too heavily from one source and not enough from another.
There are different ways these are constructed; some are threaded, others are built into the skimmer. Do not expect a Hayward or Pentair model to function identically to an American Products part.
Precautions Before Making Adjustments
Safety is paramount. Never put your hands in suction equipment that is running. To inspect the diverter or get to the skimmer basket, the pump must be off. A sensible procedure would be:
1. Shut down the pool pump. 2. Open the skimmer lid in accordance with the manual. 3. Take out the basket and give it a clean. 4. Have a look at the diverter valve for any warping, cracks or poor fit. 5. Put everything back in place and restart to see how the water is moving.
Use gloves and eye protection for dirty work and heed the labels on any treatment chemicals.
Pitfalls to Avoid
Do not think a diverter is a panacea for all circulation woes. Some common errors are to let the basket go clogged, to try and block return jets to force the flow, or to overlook a filter in need of cleaning. Another is to assume a sticking valve is normal. When making changes, do them one at a time to gauge the effect rather than fiddling with several settings at once.
Knowing When to Get Help
If basic maintenance has been done and the water flow is still not right, or if the skimmer housing shows signs of cracking, it is time to call a qualified professional. The same goes for suspected plumbing or pump issues that could indicate a more serious fault in the system. An expert can verify the pump, filter and diverter are in safe working order. And of course, if there is an electrical problem or the water is not up to standard, keep out of the pool.
In Summary
For directing water and keeping the pool in balance, a skimmer diverter valve has its place. But it is only as good as the rest of the system. Make sure the pump is off before you start, tend to the basket and if the situation calls for it, leave the rest to an expert.