Just before applying your calcium spray on your plants, make sure you dilute it in water (non-chlorinated). increase it to a spray bottle then apply it to the foundation zone. Applying it to foliage won’t automatically operate. By contrast, when you click on a Microsoft-supplied ad that seems on DuckDuckGo, https://judahjctka.angelinsblog.com/29062709/the-basic-principles-of-calcium-nitrate-hydroponic-fertiliser