Big pH swings

Hey all, hope everyone is good. So I've got a little problem that I've been fighting during this grow. I set my pH at 5.85 or so, and the next morning when I check it, it's down to 4.5 I haven't had this problem before, I have always had to bring pH down. Using GHE trio (well Micro and Bloom only in this stage - Weekly feed) - Calcium/Magesium (more about this later) and GHE Bloom Booster. I was using some hydroguard product, but I thought this is what was causing the bad pH swings. Nope. Last two water changes I didn't add any hydroguard (got cold water temps anyway) and the pH still swinging into the 4's. I got to use some GHE pH Up to bring it back to normal. About the Cal/Mag. The plant started to show signs of a magnesium deficiency. I increased the Cal/Mag to 20 ml per my 15 liters of water and the problem went away. The plant is starting to look good going on its 4th week of flowing. I got a couple of low branches on one side...running a little test of not pruning to see what happens. Well...plant tries to fall over on that end already Need a new hydro bucket that stops the netpot from being able to tip over. But I digress... Anyway, if anyone knows what could be causing the pH to go down let me know. Thanks in advance. Plus....need to update my journal. Work is keeping me busy.

What bloom booster are you using? Link? Plants still look good so you're doing a good job staying on top of the PH swings. How are the roots doing?

SnoopyDoo said:

What bloom booster are you using? Link? Plants still look good so you're doing a good job staying on top of the PH swings. How are the roots doing?

Click to expand...

Roots are looking good. Strong white... Little tint of red/brown from the bacillus Amyloliquefaciens. But not using this anymore This is the bloom booster I am using (click) I guess it's called something else now. The directions say 3-5ml per liter of water. This week is the only time I used it at 3ml per liter. The week before I only started out with 15ml in 15.5 liters of water. Starting to look frosty.

Looks good. What is the NPK rating on that booster? Too much Phosphorus could be the cause of your problem.

Also, that looks like an organic, which you should generally avoid in a hydrobucket. Try their KoolBloom liquid product if you want a bloom booster in your bucket.

Curious what you are using for taking pH readings?