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Availability:
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Gates 43501 Water Pump
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Size: 7,500 - 20,000 gallons
Pattern Name: 1 Unit
Features
- Eliminates all types of Pool Algae
- Reduces chemical demand
- Effective for up to 6 Months
- NSF/ANSI 50 Certified
- Ideal for Chlorine, Salt, UV or Ozone systems
- New formula now with 3 Active Ingredients
Description
Pool Rx+ [Pool Rx Plus] is the updated algaecide formula from Pool Rx. Pool Rx+ contains three active ingredients, Copper Sulphate, Zinc Sulfate and Silver Nitrate, adding additional layers of protection to the original Pool Rx formula you have come to trust. The blue Pool Rx+ pool unit is an EPA Registered, NSF/ANSI 50 Certified, swimming pool algaecide supporting 7.5K-20K gallons of water. Pool Rx+ reduces chemical demand, improves water quality, simplifying pool care for up to 6 months. The Pool Rx+ pool unit is effective in rejuvenating the Pool Rx+ minerals for up to 1 year in your pool. For best results, start with a new Pool Rx+ pool unit at the beginning of each swim season. For year-round pool use, add a Pool Rx+ booster after 6 months, or if you see algae coming back sooner. Pool Rx+ products can support any size body of water & are ideal for use in Chlorine, Salt, UV or Ozone pools
Brand: poolrx
Item Weight: 13.1 ounces
Item Form: Tablet
Product Benefits: Controls Algae
UPC:
Brand Name: poolrx
UPC: 700553310013
Number of Packs: 1
Number of Items: 1
Unit Count: 1 Count
Item Type Name: Swimming Pool Algaecide
Manufacturer: Pool Rx
Model Number: 331001
Manufacturer Part Number: 331001
Item Form: Tablet
Product Benefits: Controls Algae
Item Weight: 13.1 ounces
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, Oct 17
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 7,500 - 20,000 gallons
Pattern Name: 1 Unit
I've been using this PoolRx device for almost a year and a half. It is ABSOLUTELY BRILLIANT!! Prior to this, I was using a floating Solar Shock unit which I purchased online from Costco. The Solar Shock worked well, but required weekly copper rod cleaning that was a PITA!!! It was messy, requiring you to scrape the copper rod with a wire brush, and soak the screen filter housing in CLR to keep it from getting completely calcified from hard water. During a calcium build-up cleaning by a professional company, I inquired about their weekly pool service (just to see what it would cost). When i got the quote from them, I noticed that they required that you have a PoolRx unit in order for them to honor the price they quoted. I had never heard of it, so I did a quick search and found that it's basically a MUCH BETTER version of the Solar Shock unit. You stick this item inside the pump basket. When your pool pump runs for normal cleaning, the chemicals inside this device disperse into your pool (it's invisible...no noticeable chemical smells or color). As these chemicals pass back through the pump basket, they interact with the copper rod located on the inside of the device and it actively keeps algae from growing in your pool. You still need to maintain some chlorine in your pool, but it has literally cut my chlorine usage IN HALF during the summer months in AZ. I went from 4+ chlorine tabs per week (in the 110+ degree summer months) down to 2. In the winter months, I use about 1 chlorine tablet every 2 weeks. I also have a unique "water wall" that acts like a high-end spa where water flows down the wall and creates a unique ambiance. The top of this water wall has a trough that stores a lot of water and during the summer months, that water can get NASTY in a hurry. I run the pump for this twice a day during the summer months to cycle the water, but with this PoolRx unit, a couple chlorine tabs and weekly shock treatments (necessary for my setup) my pool is crystal clear with absolutely no algae build-up (even when the water temps reach the 90s). Several summers back, even with the Solar Shock unit, I could not get the algae under control and eventually had to drain the pool, get it acid washed and start over. Take it from someone who has to maintain a pool in AZ, this thing WORKS! You need to add the refill chemicals every 4 to 6 months to keep everything working and you need to replace the whole PoolRx unit every year because the copper rod dissolves over time. For peace of mind knowing I won't have algae, the cost savings of 1/2 the chlorine usage, and it doesn't require maintenance...this thing is absolutely getting 5 stars from me. Hope this review helps.
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Reviewed in the United States on April 3, 2025 by Harley
Size: 7,500 - 20,000 gallons
Pattern Name: 1 Unit
My pool guy had recommended this stuff to me and offered me a discount on weekly service if I let him use it in my pool. He charged me $90 a year for the PoolRx (which he didn't name, he just called it a "mineral treatment" and I later found out what it was) and discounted my service $10 per month, so it was a net savings for me, it made his job easier, and now I see it probably saved him money on chlorine, too. I later took over the pool maintenance on my own to save money and looked for advice online. I found a very knowledgeable community on a certain website that was full of great advice and pool care tips, but some of the more vocal, condescending members of the forum were very against using any type of mineral additives like Pool Rx and would ridicule anyone that said they were going to. It seemed that more than anything they were stuck in their ways, but they had some credibility and made some plausible arguments against it, so I followed the advice and was using only liquid chlorine to sanitize and keep algae at bay. I was having to shock my pool a lot more than I had liked and the algae still appeared in some areas even though I was keeping my pool at 5 ppm chlorine most of the time. That's higher than I wanted to keep levels at but algae would get bad if I didn't (and yes, stabilizer and Ph were ON POINT). I was going through a lot of chlorine. After about a year of this, I said the heck with it and bought the Pool Rx. Huge difference, right away. I bought the 7.5-20K gallon size for my 22K gallon pool because that was what my pool guy had used. It has worked great and I have had no algae and no problems with chlorine levels kept at 1-1.5 ppm through the hottest 4 months of a Phoenix summer. Chlorine has even dropped to 0.5 ppm a couple of times when I had to go longer than normal between servicing it, but I still had no problems. I have not experienced any of the negatives that the "experts" had warned about. No increased scaling or staining, no green hair, no problems with the pump or equipment. Just clear water, a pool that is easier to maintain, and a pretty good savings on chlorine. I added this canister in May and I plan to add the booster in October, then I'm starting over with another canister next May.
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Reviewed in the United States on September 20, 2023 by Hughe Jass
Size: 7,500 - 20,000 gallons
Pattern Name: 1 Unit
I have a Pebble salt water pool with cartridge filters. I helicopter my pool so the chemistry is ALWAYS correct. I have clean filters and skimmer, no debris. Our pool water here in Phoenix hits 90+ degrees in summer. After all my due diligence, I found algae on the walls. I could not believe it! I had MORE than enough chlorine, CYA around 40, almost no phosphates, and all other numbers in perfect range. Discouraged does not even describe how I felt. The water was not green water, just the beginnings of algae on the walls. After shocking and (treating for phosphates out of desperation), two weeks later it began to happen again. This is when I reluctantly decided to try PoolRx. I just had a visceral reaction to the thought of putting metals in my pool, but after doing as much research on the product as possible, I decided to give it a go. Before PoolRx, I was running my pump 9 hours a day with the chlorine generator at 100%. My chlorine would be around 3. Now, after 3 days of PoolRx I'm running my pump 7 hours a day and keep turning my generator down. I am now down to 40% and Chlorine is still at 3. The water is more clear and gorgeous than I've ever seen it. I'm still nervous about lowering Chlorine down to 1, which is what they recommend, but I'll see. So far, I'm very impressed with the results. To avoid problems others may have had, FOLLOW THE INSTRUCTIONS FOR USE EXACTLY!!! I REMOVED my filter cartridges, added PoolRx to the PUMP basket and ran the pump for a day. Then I installed brand new cartridges (only because mine were 5 years old). Testing daily, my chlorine started rising so I began slowly dropping my pump run time which was 9 hours, keeping an eye on my Chlorine. 7 hours is about minimum for me so the floor cleaners can do the job. After a few days the Chlorine was still 3. After that I dropped my SWG to 70%, still no problem, then 50%, still no problem. The Grandkids were over yesterday in the pool so I expected Chlorine loss, but it didn't happen. This morning my Chlorine was at least 2, so I dropped my SWG (Chlorine generator) to 40%. I'll check again in the morning. At this point I am becoming a believer! UPDATE: I'm turning it OFF today to let my Chlorine drop to 1 which is what PoolRx recommends. Based on my previous knowledge, this was scary to me. Considering that before I had to run it at 100% all day long just to hold Chlorine at 3, I can't tell you how impressed I am with this product. I should add that Chlorine demand is probably low due to inactivity but before I ALWAYS had to have my generator running 100% for 9 hours a day REGARDLESS and then add MORE on active days. Again my water temp is 90 right now and the sun is screaming hot all day here in Phoenix area. Currently my pump is running 6 hours a day and my generator is at 50%. Chlorine is at 1 (I check it everyday). I have CRYSTAL CLEAR WATER LIKE FROM A BOTTLE, NO SIGN OF ALGAE ANYWHERE. I'm saving electricity and my expensive salt cell is only working half as hard. Salt cells raise pH as well, so my pH rises more slowly now. Regardless of what some others have experienced, I LOVE THIS PRODUCT. CAUTION - BEWARE OF COUNTERFIETS !!! ONLY BUY "SOLD AND SHIPPED BY AMAZON"
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Reviewed in the United States on July 13, 2025 by Dave R.
Size: 7,500 - 20,000 gallons
Pattern Name: 1 Unit
I started my summer with mustard algae and I was struggling to get it cleared. I almost had it completely cured and I decided to add this to my pump skimmer basket and I will say that it will be a staple annually! It helped clear the residual algae and I have had no return of it. The only thing I notice, and it is mild, is that due to the mineral content, it leaves a dusty ring at the water level on the liner. It rubs right off though. I have used much less chlorine and have had to add zero other chemicals in the last 2 months. I will continue using it for sure!! My pool has been perfectly balanced too!
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Reviewed in the United States on August 14, 2026 by Donna C.
Size: 7,500 - 20,000 gallons
Pattern Name: 1 Unit
Wish I would have bought this YEARS AGO!! If you’re debating due to price, JUST DO IT! Saves you so much more money in the long run because you can use less chemicals! Once I forgot to shock in 3 weeks and still NO algae or green/brown pool. This is a must have for any above ground pool owner! This is not a paid review! Just truth!
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Reviewed in the United States on August 17, 2026 by Amazon Customer
Size: 7,500 - 20,000 gallons
Pattern Name: 1 Unit
This has worked so well with keeping my pool blue! I’ve been so happy with the pool rx, it’s also helped me not to blow through my chlorine tablets as quickly
Reviewed in the United States on July 21, 2026 by Jaedyn Hope
Size: 7,500 - 20,000 gallons
Pattern Name: 1 Unit
I waited several months before writing a review to know if it would work as advertised and I am happy to say, it does! We have struggled with algae in our pool for two years. Last summer, we got 5 weeks of use before an algae bloom and battled it the rest of the summer, giving up and closing down the pool with green water. The amount of money we spent on treatments that did not work was incredible. We opened the pool this year and it seemed promising but after a couple weeks, it turned that dreaded teal/green color indicating algae. We used algaecide then flocculant and got clear but cloudy water, then it began turning green again. I read a lot of reviews and decided to give PoolRx a try. We added it while the water was gray and cloudy. It is super easy to set up and we added it to the pump basket, which is the recommended way. It turned the water in the filter blue for a bit, which is normal. It took about two weeks to completely clear the water but ever since, we have crystal clear water despite extreme heat and humidity (perfect algae growing conditions). Our ph and alkalinity levels are perfect. Haven’t had to adjust those at all. We use 32 oz of liquid chlorine every night and maintain 2ppm on that test. It is an amazing product that does exactly what it says it does. We could not be happier. To have gone from being so discouraged that we wanted to get rid of the pool, to having perfect pool water with minimal chemicals is crazy! Thank you PoolRx.
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Reviewed in the United States on July 22, 2026 by Susanna Denninger
Size: 7,500 - 20,000 gallons
Pattern Name: 1 Unit
Been struggling with Algae all summer (2026). Spent well over $1K in shock, Algicide & Clarifier per my local pool store recommendation. I've had good experiences with them in the past but all they could tell me this season is that my levels were perfect except I was at 0 chlorine.... impossible with the amount of shock and chlorine tabs we've been adding! Saw this product recommended on a FB group and decided "what the he11, if this works then it will be worth the price". First pic is from 7/23/26 after most recent round of Shock & Algicide (before clarifier). Second pic is when I flushed the filter, drained & flushed the pump, tested levels and installed PoolRX on 7/28/26, final pic is from the morning of 7/30/26. I haven't seen this color blue all season! I am so thankful for this product. Hoping this will last the rest of the season and I'll be buying again next season.
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Reviewed in the United States on July 30, 2026 by Taylor