ph level dropping - What can be causing it to drop?

[jacobsacres]

Hello, My PH level is dropping from 6.0 to 5.2 in twelve hours. I'm running a 150 gallon res feeding 360 heads of lettuce in the flood table. The monitoring system is mixing nutrients ok/holding temp ok/ but will only lower ph if above 6.2 and not raise it if it's to low. I do have a small algae build up in the res.Could this be a factor?

[Buccaneers1]

Are you growing in rockwool? If so: https://forums.bghydro.com/archive/index.php/t-42.html

[imafan26]

How often do you change the solution? Bacterial build up and accumulated salts can also affect pH.