Cleaning Instructions: For jetted tubs use at least 1/2 teaspoon of gel per purge, no matter the size of your tub. For hot tubs, use 1 teaspoon of gel for every 125 gallons. Wipe off any excess gunk or grime from the tub surface after purge to complete the cleaning process. Removes the build-up of bio-film, oils, lotions, cosmetics, exfoliated skin and other contaminants.Can be used on Jetted Bath, Spa and Hot Tub. Available in 3 sizes; 57g, 170g and 453g. Orders placed before 11am will be dispatched same day Monday - Friday. Please visit our shop to see our full range. Should you have any questions regarding this, or any other product then please message us. We aim to respond within 24 hours. Thanks for viewing this item.