Removes Foam Easily Although hot tub foam can seem harmless, it can actually be a sign that your hot tub water isnt as clean as it should be. Whilst molecules called surfactants are the source of foam, theyre found in soap residue, bodily oils and other deposits left in your pool water. Therefore, the more foam, the more grime, scum and dirt in your water! Luckily, this Ultima-Plus XP foam remover works quickly and efficiently to remove stubborn foam. How Does it Work? This unique product neutralises the surfactant molecules. This makes the foam disappear quickly you can even see the product working within seconds of it entering the water. Make Your Hot Tub Water Clean and Fresh Make sure that your hot tub always looks its best by removing nasty foam.