Auto Guava DWC

When planting, it turned out that my liquid pH test went bad (since water from any source, even technical, had the same pH of 4.5). In this regard, the first leaves were yellow and brown and began to fall off. For the same reason, I did not start a report because I thought it would die (many people know that hydroponics does not forgive mistakes). But it was not so 😅 Guava turned out to be tenacious, I changed the water in the tank, used the old calibrated pH, and leveled it to pH 6.1. And literally within 2-3 days, new normal leaves stretched out. Please do not judge strictly, I am learning hydroponics for the 2nd time, I will try to describe in as much detail as possible what I am doing, and I will be glad to any comments and remarks in this report