The first thing you need to know when using an herbicide such as Pennant Magnum is that the exact amount of water you dilute it with is not important. It is only important to make sure you are using the correct amount of product per 1,000 sq ft of lawn. Use too much and you risk damaging your lawn, use too little and you will not get adequate results. You will need to use 11 ml -28 ml per 1,000 sq ft . To decide how much water you want to use, you should mark a 1,000 sq ft area, fill your sprayer with water ONLY, and start walking and spraying just as if you were doing the actual application of herbicide. When you are done walking and spraying the 1,000 sq ft area note how much water it took you to spray that area, and that is the amount you will want to mix 11 ml - 28 ml of product with for each 1,000 sq ft area that needs to be treated. You will need to make sure treated areas are irrigated with at least 1/2 inch of water (either by rainfall or by sprinkler) following the application.

Pennant Magnum, like most of our other concentrates, should last for years and years on the shelf.  Most manufacturers give a shelf life of at least 5 years, but products can last longer if you keep the lid on, keep the product out of direct sunlight, and shake up the container every few months to prevent the active ingredient from settling to the bottom and getting clumpy and dried out.