This solar-powered sanitizer supports cleaner pool water with fewer chemicals – all without electricity, plumbing, or effort.
buy from amazonYears ago, we installed our first above ground swimming pool. It was the beginning of a hot summer here in the midwest and we decided it was a good time to invest in our own watering hole. Unfortunately, that pool only lasted part of the season. It was a budget-brand pool that probably wouldn’t have survived the winter months, but the real problem was the water chemistry. We didn’t know how much work it would be to keep it balanced and we didn’t even understand what ‘balanced’ meant. As a result, the pool water became pond water quickly.
Just a few months ago, we decided to try again and installed a steel frame pool that would last for several years. Along with that we upgraded the filter/pump and found a good resource that would help us with understanding our water’s chemistry better than we had before. When we started this journey, our pool was filled with the city’s chlorinated tap water. We used the 3-inch chlorine tablets with our floating chlorinators and the first time we tested our water, it seemed fine, but there was a heavy choline smell. This is around the time that we were introduced to the Solar Sanitizer Tube by Card On Guard.
About Card On Guard and the Solar Sanitizer Tube
Card On Guard is a company focused on offering cleaner, more sustainable alternatives to traditional pool and spa sanitization. Founded with the goal of reducing harsh chemical use in recreational water care, they promote a science-backed approach to water treatment using photolysis—a natural UV-driven process that creates reactive oxygen species to neutralize contaminants.
Their flagship product, the Solar Sanitizer Tube, is a floating sanitizer that harnesses sunlight and ambient UV rays through a proprietary BioPhotonX™ UV film. This technology works passively in the water, producing free radicals that supplement traditional chlorine or bromine. Each tube is rated to treat up to 10,000 gallons of water and is designed to reduce chlorine or bromine use by at least 50%, helping maintain safe, balanced water with less chemical exposure.
The Solar Sanitizer Tube requires no electricity, plumbing, or complicated installation. Simply place it in the pool and allow it to work alongside your current sanitizing routine. Over time, you can reduce the amount of chlorine you use while still keeping the water clean and comfortable.
Card On Guard positions this product as an easy, cost-effective way to improve water quality while easing the burden of traditional chemical maintenance, especially for outdoor pools and spas exposed to regular sunlight.
Main Features
Solar-Powered Operation Uses sunlight to power the ionization process; no batteries or electricity needed. Mineral-Based Sanitizing Releases copper ions into the water, which help kill algae and bacteria. Reduces reliance on chlorine or other harsh chemicals. Floats in the Pool Designed to float on the water’s surface while it sanitizes. Coverage Area Typically rated for up to 10,000 gallons of pool water per tube. Replaceable Copper Anode Contains a copper coil/anode that slowly dissolves over time. Usually lasts 1–2 swimming seasons, depending on pool size and usage. Mesh Trap for Debris Many models include a mesh cage to help trap small debris and keep the anode clean. Low Maintenance Periodic brushing or cleaning of the copper anode is usually all that’s needed. Chemical Reduction Helps reduce chlorine usage by up to 80%, depending on bather load and weather. Safe for All Pool Types Works in above-ground and in-ground pools, with vinyl, fiberglass, or concrete linings. Eco-Friendly and Cost-Effective One tube costs $39.00 vs the cost of 12-months of 3-inch Chlorine Tablets (estimated at $60).User Experience & Testing
When we were approached about testing this product, we weren’t entirely sure how to do it. It arrived in a simple cardboard box and with the tubes included along with directions on how to break them down for recycling. There is no set-up or assembly required. You just drop them in the water. Here is the approach we took for testing as well as the water test results at the different steps in the process. I want to point out that we worked with a local pool maintenance company for the water testing and chemical balancing.
Beginning
We tested our water as it was at the beginning of the process. Upon our pool’s setup in May, we started using two floating chlorinators to distribute the chlorine throughout the water. Because we were concerned about it turning to ‘pond water’ given our past experiences, we over-compensated and used eight tablets (four 3-inch tablets in each chlorinator) for several weeks until we dropped the Solar Sanitizer Tubes in. The water test marked June 28 represents this period of time.
Result: Pool was not properly sanitized (near-zero chlorine), pH and alkalinity were low, and the water had little to no stabilizer. We were instructed to add some sodium bicarbonate and Shock to help raise the alkalinity, pH, and free chlorine.
Retest #1 – July 3
This test showed a much improved chemistry balance. The pH was still moderately low so we added a bit more bicarb and then put the Solar Sanitizer Tubes into the water. Users are instructed to add the tubes after the water is balanced. Then you can start reducing the amount of chemicals you are adding over a 3-week period. At this point, we took out one of our Chlorinators and only had one floating in the water with four tablets of chlorine in it.
First Water Test – Jun 28Retest #2 – July 10
The test shows that the water chemistry is very healthy — even with the decreased chlorine usage. Solar Sanitizer Tube seems to be helping maintain chlorine levels with minimal added chlorine. The increase in free chlorine with stable pH and alkalinity shows things are working as intended. The CYA level was noted as being close to the higher range, but still in the ideal range. The only way to adjust this level is to dilute the existing water in the pool by partially draining it and refilling it.
Why did this happen? It happens because of the type of chlorine you are using. The chlorine tablets include cyanuric acid (CYA) as part of their composition and every tablet you add to the water increases this level. Over time, even with no over-chlorination, the cumulative effect of using trichlor will cause CYA to trend upward, even if your chlorine levels stay constant or low. Since we starting using less tablets at this point, we were slowing the CYA buildup, but were looking at a partial drain in the future. Since we were still doing these water tests, we decided to delay this step.
Restest #4 – July 22 (Final)
At this point in the process, we dropped down to a single chlorine tablet in the water in addition to the Solar Sanitizer Tubes. The water test indicated that the free chlorine was steady at the ideal level. The fact that chlorine levels held steady despite the big drop in tablet use indicates the Solar Sanitizer Tube is contributing effectively.
Upon analysis of the test result, the pool mainenance rep noted that the pH level was trending high, but not in the emergent treatment stage. He said the only thing he would recommend at this point would be to add some (approx. 1/2 gallon) of muriatic acid for balance. This would bring both the pH and alkalinity down. Comparing the test results between July 10 and July 22 side-by-side you can see that the levels — while a little high — were virtually the same. This means the water chemistry is stable.
So, Does It Work?
Based on the test results we’ve had over the past month, I feel confident saying that the Solar Stabilizer Tube does work. Here are the reasons why.
Free chlorine has remained ideal even as we cut chlorine use significantly. Water balance (pH, alkalinity, stabilizer) has been consistent since adding the product. No signs of chloramine buildup (which would show up as total chlorine rising faster than free chlorine). No rapid pH drops or algae growth, which would indicate sanitizer weakness.So where do we go from here? We plan to continue monitoring the water weekly and ensure that the free chlorine level continues to hold with just 1-2 tablets in the water with the Solar Tube. We also plan to do the other steps suggested by the pool maintenance company within the next week to completely balance the water out. The only other concern we might have is the level of copper in the water that can build up as a result of using the tubes, but that’s a very minor concern. Unfortunately, that does require a special type of test strip as it’s not on the standard water test strip for pool chemistry.
Conclusion
I’m very excited that the Solar Sanitizer Tube by Card On Guard delivers on its promise of supplementing traditional chlorine sanitation with a more sustainable and lower-maintenance approach. In just a few weeks, we saw a significant reduction in chlorine usage without any drop in water quality or clarity. With our pool maintaining stable pH, alkalinity, and chlorine levels – even with fewer tablets – the tube proved to be a reliable tool in our pool care routine. For those wanting to reduce chemical dependence and simplify pool maintenance, this is a product worth considering.
For more information, visit cardonguard.com
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