Yes, you can put chlorine tablets in the skimmer basket, but it requires caution
You can place chlorine tablets in your skimmer basket, and many pool owners do this as a convenient way to treat their water. The skimmer pulls water through the basket as it circulates, so tablets dissolve slowly and release chlorine into the system. However, this method has real drawbacks: tablets dissolve unevenly, can damage the skimmer basket itself, and may create chlorine levels that spike and then drop unpredictably.
A better approach for most pools is a floating chlorine dispenser or a dedicated chlorine feeder mounted on the return line. These give you steadier chlorine levels and protect your equipment. If you do use the skimmer basket method, you need to monitor your chlorine levels closely and understand what can go wrong.
Key Takeaways
- Chlorine tablets in the skimmer basket dissolve as water passes through, but the process is uneven and can damage the basket over time.
- Tablets release chlorine in bursts rather than at a steady rate, which means your pool's chlorine level will spike and then drop between tablet additions.
- The acidic nature of chlorine tablets can crack or weaken plastic skimmer baskets, especially if tablets sit directly on the bottom without moving.
- A floating dispenser or in-line chlorine feeder provides more stable chlorine levels and protects your skimmer from chemical damage.
- If you use the skimmer basket method, test your water at least twice a week and replace tablets before they fully dissolve.
How chlorine tablets dissolve in a skimmer basket
When you drop a chlorine tablet into your skimmer basket, water flowing through the basket gradually dissolves it. The tablet sits in the basket as the pump pulls water past it, and chlorine leaches into the water stream. This happens slowly over several days, depending on your pool's circulation rate and water temperature—warmer water dissolves tablets faster than cold water.
The problem is that dissolution is not even. The tablet's outer surface dissolves first, so the chlorine release is heaviest at the start and tapers off as the tablet shrinks. You end up with a chlorine level that climbs for a day or two, then drops as the tablet gets smaller. This makes it hard to keep your chlorine in the ideal range of 1 to 3 parts per million (ppm).
Damage to your skimmer basket from tablets
Chlorine tablets are acidic—they lower your pool's pH as they dissolve. If a tablet sits directly on the plastic basket without much water movement around it, the concentrated acid can soften or crack the basket material. This is especially true if you live in a hot climate where tablets dissolve quickly and release their acid in a small area.
Over weeks or months of using tablets in the skimmer, you may notice the basket becoming brittle, discolored, or developing small cracks. Once the basket is damaged, it no longer catches debris effectively, and you may need to replace it. A new skimmer basket typically costs $15 to $40, but the hassle of removal and replacement is worth avoiding.
Uneven chlorine levels and what to test for
Because tablets dissolve unevenly, your chlorine level will fluctuate. You might test the water on Monday and find 2.5 ppm (good), then test on Wednesday and find 0.8 ppm (too low). This up-and-down pattern means algae can start growing during the low periods, even if your average chlorine is acceptable.
If you use the skimmer basket method, you need to test your chlorine level at least twice a week—ideally every other day. Use a reliable test kit or digital tester, not test strips alone, because strips are less accurate at low levels. When your reading drops below 1 ppm, add a new tablet rather than waiting for the old one to finish dissolving.
Better alternatives to skimmer basket dosing
A floating chlorine dispenser is a plastic cage that holds one or two tablets and floats freely in your pool. Water circulates through it as the pool moves, so the tablet dissolves more evenly than in a stationary basket. Floaters cost $10 to $25 and are straightforward to use—just drop a tablet inside and let it drift. The downside is that they can get stuck against the wall or in a corner, which slows dissolution in that spot.
An in-line chlorine feeder mounts on your return line (the pipe that sends water back into the pool after the filter). Tablets go inside the feeder, and all your pool water passes through it, so chlorine dissolves at a steady, predictable rate. Feeders cost $50 to $150 and require basic plumbing to install, but they give you the most stable chlorine levels. They also protect your skimmer from chemical damage.
A third option is a salt chlorine generator (also called a salt cell or salt chlorinator), which produces chlorine from salt dissolved in the water. These systems cost $500 to $2,000 installed but eliminate the need for tablets altogether and keep chlorine levels very steady. They are best for pools you plan to keep for many years.
Steps if you decide to use the skimmer basket method
If you choose to put tablets in your skimmer basket despite the drawbacks, follow these steps to minimize damage and keep your chlorine more stable:
- Place one tablet in the basket at a time—do not stack multiple tablets, as this concentrates the acid in one spot.
- Make sure the tablet sits on top of the basket material, not wedged against the bottom or sides where water flow is slowest.
- Test your chlorine level every other day using a liquid test kit or digital tester.
- When your chlorine drops below 1 ppm, remove the old tablet (even if it is not fully dissolved) and add a fresh one.
- Check your skimmer basket monthly for cracks, discoloration, or brittleness. Replace it if you see damage.
- Test your pH at the same time you test chlorine. If pH drops below 7.0, add a pH increaser (soda ash) to bring it back to 7.2 to 7.6.
Signs your skimmer basket is being damaged by tablets
Watch for these warning signs that your basket is suffering from chlorine exposure. The plastic may turn white or yellow, especially around the edges. The basket may feel softer or more flexible than it should, or you may see small cracks forming. If the basket is no longer holding its shape or if debris is getting past it into the pump, it is time to replace it.
If you notice damage early and switch to a floating dispenser or feeder, you can prevent further harm. Continuing to use a damaged basket risks debris reaching your pump, which is a much more expensive repair than a $20 basket replacement.
Frequently Asked Questions
Will chlorine tablets in the skimmer hurt my pump?
Not directly, but a damaged skimmer basket can let debris through, and that debris can clog or damage your pump. The tablets themselves do not harm the pump—the risk is from what gets past a weakened basket. Replace your basket if you see cracks.
How long does one chlorine tablet last in a skimmer basket?
A standard 3-inch tablet typically lasts 3 to 7 days in a skimmer basket, depending on your pool size, circulation rate, and water temperature. Warmer water and faster circulation speed up dissolution. Test your chlorine every other day to know when to replace the tablet.
Can I use chlorine tablets in the skimmer if I also use a salt chlorinator?
No. A salt chlorinator produces its own chlorine, so adding tablets will push your chlorine level too high and waste money. Use one method or the other, not both.
What should my chlorine level be if I use the skimmer basket method?
Aim for 1 to 3 ppm, the same as any pool. Test every other day because levels will fluctuate more with the skimmer basket method than with a feeder or dispenser. If you see it drop below 1 ppm, add a fresh tablet.
Is it cheaper to use the skimmer basket than a floating dispenser?
The tablets themselves cost the same either way. The skimmer basket method is free if you already have a basket, but you risk replacing it sooner due to acid damage. A floating dispenser costs $10 to $25 upfront and protects your equipment, so it often saves money over time.