Answer: To mix a 1:10 ratio, you use one part of chemical concentrate for every ten parts of water. For example, if you are filling a 11-litre bucket, you would use 1 litre of chemical (like Multi-Clean) and 10 litres of water. Our calculator above does the math for you—simply enter your total container size and the ratio required.

Answer: The first number (1) always represents the chemical concentrate, and the second number represents the parts of water. A 1:4 ratio is a “strong” mix (20% chemical), typically used for heavy-duty degreasing with products like Black Ripper. A 1:20 ratio is a “weak” or diluted mix (about 4.7% chemical), ideal for light surface cleaning.

Answer: Always add the water to your container first, then add the chemical concentrate. This is a critical safety practice known as “A.A.” (Add Acid/Chemical to water). Adding water to a concentrated chemical can cause splashing or an exothermic reaction, which can be dangerous.

Answer: For heavy cement build-up, Cement Off Organic is typically used at a 1:1 ratio (equal parts water and chemical) or for moderate, newer build-up 1:3 ratio. If you are cleaning light residue or “haze” from tiles, you can dilute it further to 1:6. Always check the specific product page and/or label for the most accurate application instructions.

Answer: Yes. Many industrial weed killers, such as our Concentrated Weed Killer, require high dilution ratios like 1:100. This calculator accurately determines how many millilitres (ml) of concentrate you need for your backpack sprayer or spray tank.