Chuangdi24 Pieces Oil Absorbing Scum Sponge for Hot Tub Accessories, Swimming Pool and Spa, Flower

Work great, turn color once they absorb stuff. I find they keep the water fresher and it becomes obvious when you need to swap them out. Fairly priced. Photo is when they need to be swapped out, arrive white and turn brown as they collect debris

So if the judgement of previous reviews are based solely on whether or not they keep their white color...then these should get 1 star... because they turn orange almost immediately when going into even clean fresh water. But....THEY WORK! Which is pretty important to me. All I know of that I had a tub with a slight oil residue on the surface...threw one of these in and the water has been crystal clear since. It really does clean up the water very well. So I'll continue to buy them... because I don't care about the color.***Update***My teenage daughter and her friend used the hot tub recently. Although we ask everyone to shower before going in, when she goes in with her friends, the water looks disgusting by the end. Imagine dumping a bottle of ranch dressing in the water....you get the picture. All the lotions and hair products are horrible. I threw 2 fresh sponges in the water and checked back the following morning. The water is now sparkling clean! To me, this was the ultimate test. These work.

These are shocking, they don’t grow to normal size once opened without putting in water. Once in water they just soak it up.Hopeless at collecting oil. Basically just a sponge.

Great and easy to use. Great quality for price.

We use our Hot Tub every day and Have kids in and out regularly. It drives my husband nuts as we can upset the water balance - let’s be real we are not making guests take a shower first and they do wear suits that have detergent in them! It’s also summer in Alberta Canada and lots of fuzz & bugs get in the water.We put three of these in yesterday (I think my husband thought they were crapy) I can literally see the dirt, oil and small little bugs/debris on them. Disgusting! Hot tub water crystal clear.Highly recommend to soak up any lotions/sunscreen/soaps/organic debris to help you keep your water… well just water!At the low price I’ll be throwing these out and replacing often. We have used the orange sponge in the past that costs $15 each but can’t be squished - we have kids and they always squish it so using these and throwing out is a much better option!