GLB Pool & Spa Products 71114 1-Quart Strike Out Algaecide

This stuff is amazing. After spending 2 months buying everything under the sun and battling algae daily. One treatment and the next morning water was clear as a bell! Has stayed clear every sense. Only treated once! Worth every penny! Just buy it!

I wish I would have taken pics. Our pool has been weeks of cloudy and then green. All the store bought stuff did nothing. This is the 2nd time I ordered this and it is a god send. Give it a day or two to see the results. I think some people think it's instant. It's not instant, but once it works it never stops working. The rest of the season I swear I could go chlorine free and it would still be crystal clear. Save yourself the worry and just buy this

I've used GLB algeacide for many years in residential and commercial pools. Due to its quality, it takes only about 4 oz. to kill all algae spores in pools. I use a small amount pre-swim season to prevent water from turning green, again during heavy pollen season and then after the temperatures in my pool drop to around 60°. I've never had an issue with algae, discoloration of hair and my heavy metals readings are non-existent during swim season. 🏊‍♀️

Last year I battled the dreaded black algae and tried everything at the pool store. No luck. As a last resort I ordered this stuff and it seemed to be working. This summer I have used nothing but the GLB and have had no major issues. I use it about every other week and have only had mild algae that easily brushes off unlike last year that was a steel brush three times a week. I am now convinced that pool stores only sell stuff that cures one problem and creates another. I'd recommend this stuff and would give it 5 stars but like I said, very light algae persists even a day or two after applying.

I cringe when it’s time to reorder chemicals because of the expense but this stuff earned a permanent spot on my must-have list for regular pool maintenance. My wife and I moved into our house with ~32,000 gallon pool 5 years ago; first time pool owners. Most of the first year I had no problem keeping it clean but after a particularly heavy storm one day, and delay in being able to clean up the leaves and small branches that blew in, the organic debris threw the chemical balance out of whack and we found ourselves with a green pool. I knew I needed an algaecide and promptly treated using a brand I found at a local store but unfortunately it barely made a difference. Did a little better searching and found GLB on amazon and decided to try it because of the copper ingredient, I knew copper will kill a full grown tree and stumps so figured it should have an impact on algae. I followed the directions on the bottle and within 24 hours our pool was clear with no trace of algae. Ever since I’ve made sure to have a full bottle of this on hand for emergencies and a second for weekly preventative treatments. For weekly treatments I use very little, I just eyeball it but it’s probably about 1/2-1oz poured in front of the water return in our deep end. Following this routine our water has stayed clear ever since, we did have some minor wall algae and on our steps a couple times over the years due to neglected chlorine levels but a doubled dose of my usual GLB weekly treatment directly in the area of the algae breakout has wiped it out by the next day every time. Again, this stuff isn’t cheap but in my applications it has worked reliably every time.

Amazing product. I had covered my pool for a week with the solar cover took it off and had green algae. I tried everything to combat it. Other products from the stores like Walmart and shock. We were going to be closing the pool and I was so frustrated. I went online to Amazon, searching products by reviews, and found Strikeout. I poured it in and didn't follow the directions.. Oops. But within 2 days without scrubbing or wipping side walls or ladder the entire pool was crystal clear. I am not kidding you. Not one trace of green anywher at all. I am buying more of this for next summer. If you have a algae you need this product. I wish I had pictures to show you how green my 27 ft above ground pool was. It was completely green.

The product works, but it’s really more for pools. It’s highly concentrated and such a tiny amount is required for a spa that it is difficult to measure correctly. It’s not a bad product, but it should not be advertised as being for spas. I have a small hot tub and I would have ordered something else if I would have known this.

Just poured a small amount in pool and it cleaned up algae within a day…. It’s been clean for a week.