Sodium Hypochlorite 14-15% 4x5L, Patio Cleaner | High Strength, Swimming Pool Chlorine, Pale yellow (SH1415-20)

Brilliant. This stuff is great at dissolving your most recent kill. There might be a few teeth left at the end, but, works a dream.

Chlorinated the pool. Good value for money, strong formula great for people who don't or can't have tablet floaters. Very effective at keeping the pool clean.

Works well undiluted on very dirty patio with black spot. Does not get well rooted black spot off but makes a big difference. Second coat makes no difference so I reverted to metal brush in places. Definitely use PPE as very corrosive and smells very strong. Would definitely use again, good value for money and well more effective than weaker rubbish sold as miracle patio cleaner.

Diluted 4l product to 1l water because we had so much black spot. The black spot had never been treated and was getting progressively worse. The patio is jet washed every 2/3 years but that always left the black spot. I used a small hand held sprayer to apply the product, to avoid plants and the lawn and then left it. This product works with no effort at all! No brushing or rinsing, in fairness I knew it was going to rain later. My slabs are Indian sandstone, they’re porous and absorbed the product. I’m utterly amazed and won’t be jet washing or buying anything other than this again.

Worked well when applied to black spot mold on a driveway neat.

This was my first time using hypo. I went with a 5:1 ratio on a sandstone patio. It was a warm day so I couldn’t let it dwell as long as I would on an overcast day. The result is very good, most of the grime and black spots have gone after just one application. Splashes will ruin your clothes, as others have written, use PPE and wellies.

Use this product to clean my patio. Does a great job… removes everything with ease.

This product did a good job cleaning my slabs. Would buy it again