<span class="link_user">@StickyDiary</span>, It took a little trial and error to get the right amount of time, at the right level (1-10), and the right amount of time between each 'monitoring'. I use a 15 gallon reservoir which I usually only fill from 5 to 10 gallons max. In that range the right settings for me is 2 seconds, at Level 1 , with 30 minute intervals between readings/adjustments.
<span class="link_user">@StickyDiary</span>, I use 2 AC Infinity peristaltic pumps with the new ACI Hydro Sensor. The Hydro sensor tracks PH and EC. I use an automation within the ACI Controller AI+ to set the high and low limits. When the AI+ controller detects I'm out of range it releases either PH Up or Ph Down as needed to get the reservoir back within limits. Saves me a TON of time. No more measuring Ph each morning and then adjusting.