Don't know Mr E, mine usually goes up as the plants get bigger. Only time i've had ph probs too low was when using new medium that I didn't rinse super well. You use RO water right?
Weedhound Reviewed by Weedhound on . PH Dropping quickly? I'm sorry to post this question, I tried to search but the term "PH" is too short for the boards search function... I'm having to PH Up my nutes more frequently as my plants grow. I'm wondering if this is considered normal, or if it is indicitive of any actual problems etc. I only use 8 to 10 gallons or so total (going to change it out and measure carefully today) and the plants are only about 10 inches tall, on their 8th node. I calibrated my continuous meter yesterday, and PH Up'd to Rating: 5