@GingerBeard Yes, I use the drop in nutrient level as the main indicator of transpiration rate. I don't use dehuey's (yet), so I don't have data on it.
Originally Posted by WelderDan
I figured this out by accident, mostly due to laziness. Got to the point I never needed PH up or down. Even quit using the PH meter altogether. Nutes brought my tap water down to 5.4 - 5.5.
It sounds like your tap water has enough of something to act just like the amount of pH up I use. I can see how that would be very convenient.
This might work with your neighbor, but possibly not for anyone 5 to 10 miles away from you. Tap water is highly variable and what works for you won't work for most. Depending on what's in your water, you may find a higher quality end product by switching to r/o. If it's 'just' the pH adjustment elements, there may be no change.
Glad it works for you. Seriously. Around here there's a huge pH/tds change in the tap-water around mid-fall. About a month before harvest season. If you want your plants to stay healthy using tap, you really have to pay attention and compensate for it.