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Mixing and diluting spray concentrates is usually a pretty straight forward task……..or so you would think. It is perhaps because it seems so easy that sometimes not enough care is taken and mistakes are made. Remember that concentrates such as insecticides, fungicides, herbicides and cleaners are by their very nature more active than the final spray and are therefore to be handled with some respect. Here is a simple guide to diluting concentrates for spraying, safely, with least waste and best efficancy. I’ve gone with a 5 litre example.

Prepare the product

Protect yourself – Put on waterproof gloves and eye protection. I also advise wearing face mask, overalls and gumboots or similar during mixing and spraying.

Liquids – Shake product well before use and let any foam settle.

Powders/granules – Shake product gently to loosen and let settle for five minutes.

Most sprayers have measuring marks on the outside. If your sprayer does not, then using a 1 Litre measuring jug, add 1 Litre at a time to the sprayer and mark each level with an indelible marker.

Measuring jug and sprayer

If possible use a 1 Litre measuring jug dedicated to the type of product to be used i.e. garden insecticide/fungicide, selective weed killer, non-selective weed killer, household insecticide, moss and mildew killer, etc. Rinse out measuring jug and sprayer with clean water.

Quarter fill the measuring jug with clean water. Carefully add required amount of concentrate or powder/granules to the water in the jug (if powder/granules- stir until dispersed). A Kiwicare cap full is approx. 15ml for measuring purposes.

With clean water rinse out the measuring cap/cylinder into the jug at least 5 times. Add clean water to the jug until the level reaches 1 Litre. Add the mixture to sprayer. Using the measuring jug, add 4 more Litres of clean water to the sprayer. Using a jug is unlikely to cause foaming, but if foaming occurs, slow the addition of water. Let liquid sit until foam subsides before completing filling. Do not let foam spill from the sprayer.

Sprayer only

Rinse sprayer with clean water. Add 1 litre of clean water to the sprayer. Carefully add required amount of concentrate or powder/granules to the water in the sprayer (if powder/granules- stir until dispersed). A Kiwicare capful is approx. 15ml for measuring purposes. Using clean water, rinse out the measuring cap/cylinder into the sprayer at least 5 times. Add clean water to the sprayer until the level reaches 5 Litres (or depending on the quantity you wish to prepare).

Note: If foaming occurs, slow the addition of water. Let liquid sit until foam subsides before completing filling. Do not let foam spill from the sprayer.

Cleaning sprayer, jug and stirrer

After use rinse the sprayer, jug and stirrer out with clean water at least three times. It is good practise to pump clean water through the spray nozzle to clear product from sprayer head and tube.

If a diluent (solvent) other than water is used, the equipment should be cleaned with an appropriate cleaner such as household washing up liquid. It is also recommended that sprayer seals are checked and lubricated with petroleum gel, grease or similar to keep them in good order.

Mixing with diluents (solvents) other than water

Some Kiwicare products are not formulated to mix with water e.g. NO Borer Concentrate and NO Leaks Red Brick and Terracotta Sealant. And some products can be mixed with other diluents for better effectiveness, e.g. NO Spiders mixed with turpentine or NO Hydrocotyl mixed with diesel for control of re-sprouting stumps. In these cases the process is similar to that described above but using the appropriate solvent.

I hope this advice will help you get the best out of concentrates, stay safe, reduce spills and save you money.

Article Brought To You By Kiwicare  kiwicare-logo-50x50

Kiwicare is New Zealand’s own manufacturer and distributor of pest control, garden care and home maintenance products. The Kiwicare website contains advice on the eradication and prevention of all sorts of pests that bother us in New Zealand. Learn how to get rid of rats and mice, flies, spiders, ants, cockroaches, fleas, bed bugs and other creepy crawlies. Protect your plants from aphids, grass grub, caterpillars, weeds and more. Keep biting insects at bay with the Safari range of insect repellents. See the BioGro certified organic range of products to help you stay pest free without chemicals.

How to Mix Spray Concentrates, 5.0 out of 5 based on 30 ratings

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  1. The Kiwicare website has a great new look and many new features including interactive problem solvers for home pests and garden pests, diseases and health.
    You may find some of the links in this article try and take you to the page that no longer exists. The error page however will tell you go to the home page and you will easily find the new page on the subject you seek.

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