the PH problem on the last stage

hi experts,
i have a new PH problem now , it didn't happen before.it's the 4th week in flowering,i want to use 1200PPM of nutes to them,but after adding nutes,the water has became very acidic(PH6.8~3.5),so i need to add a lot of “PH up solution” to adjust it.
is it alright???
i afraid that the “ph up solution” will damage plants,dosen't it make the PPM up??
or i should prepare a big bottle of “ph up solution” .

You sure your pH meter is calibrated correctly? pH up wont hurt the plants, they actually like the extra potassium...

Liquid nutes are very acidic so it's normal for it to lower your reservoirs Ph, There's nothing wrong with using the PH up. Just mix it well and you'll be fine. I usually mix my nutes in with my extremely alkaline tap water and it generally evens out, cheaper to add water then it is to add ph up solution.

Impaled said:

Liquid nutes are very acidic so it's normal for it to lower your reservoirs Ph, There's nothing wrong with using the PH up. Just mix it well and you'll be fine. I usually mix my nutes in with my extremely alkaline tap water and it generally evens out, cheaper to add water then it is to add ph up solution.

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but if i dilute it with water will affect the concentration of nutes......i want to maintain the 1200ppm~~~

bump bump....help please

At this stage i would consider stopping all feeding and in two weeks cutting back on watering befor harvest.

If your using Soil that is.

If your using hydro systems i prefer cutting back on most nutrients aside from P and N 3-4 weeks be for harvest. -

Last 2 weeks i flush and stop watering.

Aside from that and to your main question , - No Potassium is VERY good for your plant in the mid/final stages of the growth.