Should You Close Your Skimmer When Backwashing Your Pool? The Definitive Guide
Do you close skimmer when backwashing? The answer is typically yes, you should close your skimmer line during backwashing to prevent drawing air into your filtration system and to maximize the force of water used to clean your filter.
The process of backwashing your pool filter is essential for maintaining clean and healthy swimming water. It removes accumulated debris and contaminants, ensuring your filter operates efficiently. However, a seemingly simple question often arises: Do you close skimmer when backwashing? The answer isn’t always straightforward, and understanding the reasons behind it can significantly improve your pool maintenance practices. This article dives deep into the intricacies of backwashing, focusing specifically on the role of the skimmer and providing you with the knowledge to make the best decision for your pool.
Understanding Backwashing
Backwashing is the process of reversing the flow of water through your pool filter to flush out collected debris. This process removes dirt, algae, and other particles that accumulate in the filter media, preventing clogging and ensuring optimal filtration performance. Regular backwashing is crucial for extending the life of your filter and maintaining water clarity.
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The Role of the Skimmer
The skimmer is a crucial component of your pool’s circulation system. It’s designed to draw water from the surface of the pool, removing leaves, insects, and other floating debris before they sink and decompose. The skimmer basket traps larger debris, while the water then flows through the skimmer line to the pump and filter.
Why Close the Skimmer During Backwashing?
The primary reason to close the skimmer line during backwashing is to prevent air from entering the system. When the pump is in backwash mode, it draws water powerfully through the filter in reverse. If the skimmer line is open, the pump might draw air into the system alongside water, potentially:
- Reducing the effectiveness of the backwashing process.
- Causing the pump to lose prime.
- Damaging the pump motor due to running dry or cavitating.
Additionally, closing the skimmer ensures that all the pump’s suction is directed solely towards the filter, maximizing the backwashing force and resulting in a more thorough cleaning.
How to Close the Skimmer
Closing the skimmer during backwashing is a simple process. Typically, you’ll find a valve (usually a two-way or three-way valve) that controls the flow of water from the skimmer and the main drain. To close the skimmer:
- Locate the valve controlling the skimmer line.
- Turn the valve to the position that shuts off the flow from the skimmer. This often involves turning the handle to a position that points towards the main drain line.
- Confirm that the water is no longer being drawn from the skimmer by observing its water level.
When Not to Close the Skimmer
While generally recommended, there are a few scenarios where you might not need to completely close the skimmer when backwashing:
- Pools with only a main drain: If your pool lacks a main drain, closing the skimmer entirely might cut off the water supply to the pump, causing it to lose prime immediately. In such cases, you might need to partially close the skimmer to maintain some water flow.
- Very Shallow Pools: If the water level is very low, even with the skimmer open and main drain, the pump might still draw air. In this case, adding water before backwashing is crucial.
- Specific Filter Systems: Always refer to your filter manufacturer’s instructions. Some systems might have unique requirements or recommendations regarding skimmer usage during backwashing.
Common Mistakes to Avoid
- Forgetting to close the skimmer: This is the most common mistake, leading to inefficient backwashing and potential pump damage.
- Completely closing the main drain while closing the skimmer: In most pools with both a main drain and skimmer, this is fine. But double-check pump stays primed.
- Backwashing for too long or not long enough: Follow manufacturer’s instructions and monitor the pressure gauge.
- Not rinsing the filter after backwashing: This can leave residual debris in the filter.
The Importance of Proper Water Chemistry
Backwashing is just one part of maintaining a healthy pool. Regularly testing and balancing your pool water is crucial for preventing algae growth, protecting your equipment, and ensuring a comfortable swimming experience.
Frequently Asked Questions (FAQs)
Is it always necessary to close the skimmer when backwashing?
In most cases, yes, you should close the skimmer line during backwashing. This prevents air from entering the system and ensures optimal backwashing performance. However, some specific pool setups or filter systems might have different requirements, so it’s always best to consult your equipment’s manual.
What happens if I forget to close the skimmer when backwashing?
If you forget to close the skimmer, the pump might draw air into the system, reducing the effectiveness of the backwashing process and potentially damaging the pump. You may also see bubbles in the return jets, indicating air in the lines.
How do I know if my pump is losing prime during backwashing?
Signs of a pump losing prime include: loud noises, air bubbles in the pump housing, and a reduction in water flow from the return jets. If this happens, immediately turn off the pump and re-prime it according to the manufacturer’s instructions.
What if my pool only has a skimmer and no main drain?
If your pool only has a skimmer, do not completely close the skimmer during backwashing. This would cut off the water supply to the pump, causing it to lose prime. Instead, you might need to partially close the skimmer while monitoring the water level and pump performance, or add water continuously during the process.
How often should I backwash my pool filter?
The frequency of backwashing depends on several factors, including pool usage, environmental conditions, and the type of filter you have. A good rule of thumb is to backwash when the pressure gauge on your filter increases by 8-10 psi above its normal operating pressure.
Can I backwash too much?
Yes, you can backwash too much. Over-backwashing can waste water and chemicals and can also reduce the effectiveness of the filter media by removing beneficial bacteria or particles. Backwash only when necessary, based on pressure readings.
How long should I backwash my pool filter?
The duration of backwashing depends on the type of filter and the amount of debris it has collected. Generally, backwash for 2-3 minutes or until the water in the sight glass runs clear. Then rinse the filter for approximately 30-60 seconds.
What is “filter rinse” and why is it important?
“Filter rinse” is a step performed after backwashing and before returning to normal filtration. It involves running the pump briefly in the forward direction to settle the filter media and remove any remaining debris. Skipping the rinse step can send dirty water back into the pool.
What kind of valve controls the skimmer and main drain lines?
Typically, a two-way or three-way valve controls the flow of water from the skimmer and main drain lines. These valves allow you to select which source of water is being drawn into the pump.
What should I do if my skimmer line is clogged?
If your skimmer line is clogged, try using a plunger or a garden hose to dislodge the blockage. You can also use a specialized skimmer line cleaning tool. If these methods don’t work, you may need to call a professional pool service technician.
Do different types of pool filters require different backwashing procedures?
Yes, different types of pool filters (sand, DE, cartridge) have different backwashing procedures. Always consult the manufacturer’s instructions for your specific filter model. Sand and DE filters typically require backwashing more frequently than cartridge filters.
Where does the backwashed water go?
The backwashed water is typically discharged through a waste line that leads to a sewer drain or a designated area for disposal. Check your local regulations regarding the proper disposal of backwash water. Never discharge backwash water directly into a storm drain or natural waterway.