KTK-50-0006 Pool and Spa 60-Percent Concentrated Algaecide, 1 Quart

All polyquat 60 is made by the same manufacturer, just bottled by different companies. So shop for the best price - and this Kem-tek is the best price I've found. It works and is cost-effective. No, there is no clear strip down the side of the bottle for "measuring" - I use a plastic measuring cup and would never downgrade this product for that reason. If the bottle has 32 ounces in it and you use 2 cups ... Just do some basic math in return for saving a major amount of money on this brand. Polyquat 60 is the only algaecide that works or is worth spending money on. I live by saltwater and have a pond on my property as well and algae blowing in and being dropped by seabirds was a continual problem that this product has finally enabled me to get a handle on.Some people have said it did not work for them. I'm not criticizing anyone, but I have found that it is important to follow exactly the instructions for using this product. If you have a large algae bloom in your pool, you must shock the bejeebers out of it before you use any algaecide. This product's directions say as much (OK, it doesn't say "bejeebers.") I had a big algae problem two seasons ago and employed the "Bejeebers Shocking Treatment," vacuumed out the dead algae (looks like grayish silt on the bottom), then used this product according to the label instructions, then vacuumed again (the label says to do this). Then I used this product in the "maintenance" dose the rest of the season. I have always had an algae problem toward the end of the season (mustard algae, yuck) but after I started using this product according to the instructions, I have now had two seasons with no algae bloom at the end of the summer. When the algae starts to rear its ugly head in late August, it's because I tend to slack off on shocking and algaecide as the summer wears on, so mea culpa. However, I have avoided algae blooms since using this product.This past Spring, this product again came to the rescue because my winter cover developed several holes (birds and ducks pecking at it) and when I took the cover off to open the pool, it literally looked like split pea soup, complete with pea clumps. I shocked and shocked and shocked and filtered filtered filtered and kept cleaning the filter daily, and when I could shock no more, I used a bottle of this Kem-Tek 60% and kept cleaning the filter daily. It took about a week and half to go from, seriously, split pea soup to clear and swimmable, and about two weeks to become sparkling clean.This algaecide is not magic. It takes work to clear up a lot of algae, but this product will definitely do its part.

I've been using poly-quat algaecide for years, but it is expensive from the local Leslie's or other pool stores. Poly-quat is non-foaming, not copper based so it won't stain your pool plaster and is highly effective at killing all types of algae. However remember that algaecide is part of a one-two punch. The other part is shock, either liquid or standard granules. So if you have a lot of algae on the walls and floor of your pool, very carefully and completely brush all the algae off the walls, floor and steps, dose with the poly-quat according to the bottle which is based on the amount of water in your pool and finally shock. Keep the filter running and no more algae!The other thing I do is to use this weekly even if I don't have an active algae outbreak as it ensures that algae won't grow. All around a great product.As I mentioned, the algaecide is expensive, but is much cheaper here on Amazon than at the pool store, is highly concentrated, 60% vs some at 20% and works like a champ!

This product works great. The problem is that when you purchase it the instructions for use are not available. Amazon needs to give us a picture of the back so we can read the instruction & start the pool prep while we are waiting for the product to arrive. There is a good amount of pool prep that needs to be done prior to adding the algaecide as well as the large amount of algaecide required if you have active algae growth. I have a 40,000 gal pool that actually required 2 full bottles for initial treatment and 1/2 to 1 bottle for mintaintence. If you want success make sure you follow all the instructions clean the pool, than super chlorinate for a few days, clean the pool again than add the algaecide. Make sure you continue with the maintainence dose or you will get reinfected. To ensure the filter was adequately treated I put 1-2 oz directly into the skimmer to reduce the dilution of the algaecide. Also when you are backwash & rinse make sure your last step is to purge the system or you may send contaminated water back into the pool.I highly recommend this product eliminating an active algae infection is not easy it will take a lot of work Kem-Tek 311-6 Pool & Spa 60% makes the effort worth it it contains a clarifier so when you finally finish you have your crystal clear pool back.

Very good algecide, keeps water clear and free of any algae. I use 4oz every 2 weeks and no issues all year long. Used for 7 years now. Highly recommended product.

good product for most algae but not best for mustard algae which can be chlorine resistant. So IF YOU ALREADY HAVE A PROBLEM AND pool is YELLOW-GREEN, consider starting w a copper containing product and use this for maintenance after pool clears. If chlorine levels are high (>3), when algae occurred, its likely you have a high phosphate level and a mustard algae infection .I am not a pool expert but read a lot and have used this 60% product and have still had recurrant issues. My pool people finally cleared my pool w a copper product (Amazon has one for $11 from another retailer and goes much further than this product). I do use this 60% for weekly maintenance.Also, my experience is that if chlorine levels are high (3-5ppm) with your stabilized chlorine tabs, adding a lot of shock will only turn pool milky green, take longer to clear and prob not needed after Copper algaecide used..My pool people say they have had no problems with "copper staining" after 2 years of use but to be safe, I only use the copper product when infected or suspected algae ,or pre-vacation.One more point: I'm not sure why, after 16 years with no algae problems, I have algae problems for last 2 yrs in mid Summer. This has been noted by others in KC area and perhaps is related to phosphoric acid reportedly added recently to cleanse our city water supply.But I'm really not convinced that is the cause and no one is dumping lawn chemicals or other phosphates that are food for algae.