I bought this to replace using BT-i biscuit tips and treatments in 100 gallon rain barrels for irrigation. If there was a dropper in the kit it would be great. Liquid is simply more convenient than my other method, which was a spoonful of BT-i bits in a tea strainer or cheesecloth swung in the water. That also worked well, but it was more effort. It's also a bit expensive.
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