House and Garden ph dropping like rock

Hi all. im using H&g entire line in dwc but ph goes from 6.2 to 5.4 in 24 hour. Feeding based on their chart. Ppm 1150 on 500 scale temp 66-67, roots are white everything grows fine im on 5th week of flower. Anyone experienced anything similar ? I used gh trio before and never had this issue. I like this line but due to ph might switch to something else.

Forgot to mention im adding silica and hydroguard to their line

Day
Temp 75
Hum 55
Night
Temp 66-67
Hum 50
I tried 3 different ph meters all same. Gavita led. Strain god knows what but its purple

When they stop talking up the nutrients the ph can drop, have you flushed them recently,

Porsche928s2 said:

When they stop talking up the nutrients the ph can drop, have you flushed them recently,

Click to expand...

nope i havent , but ph drop happening all the time , now im in mid 5th week and ph stayed 5.9 , so now im even more confused. u think amino threatment or zen can cause ph drop ? cuz i stopped using those based on their feedchart

What's the total volume of your reservoir that you are working with?

100gall

Well that's curious then if it's something that's just started this far into the grow. At first was thinking you might have been running into the plants uptaking more water than nutrients and it being really noticeable as they've gotten larger compared to the reservoir size... but unless you are running a massive number of plants or something, a 100 gal resevoir should be pretty fairly resistant to large pH swings due to ratio of water to nutrient uptake.

I have 32 plants i dont think its too much right ?

How often are you topping the reservoir off?

Everyday. My topoff is ro with 0ppm and 6.8 ph

If the amount you need to top off with every 24 hours is any serious fraction of the total reservoir size, I'd put that high on my list of potential causes for the pH fluctuations. Especially if this is something that just really started later in the grow. The plants can really start sucking up and transpiring water in relation to amount of nutrients later on in grows. Often throws me for a loop personally.