PH problem

[GardeningGram]

I need help with PH. Ladies are in 6th week of bloom of hydro. We did a change and checked ph before adding to reservior - it was at 5.9. A day later (today) the reading is at 7.0 and the plants are showing burn spots. How do we get the ph to stay down in the reservior? ppm is showing plants still taking in nutrients.

 

[GardeningGram]

The plants are Northern Lights and White Widow - 3 of each in and ebb and flow set up with 1000w HPS. A 60L reservior is being used. We oxygenated the water and the Ph was fine until a few hours later when it climbed to 7.0 and is staying there. the RT and RH is both at 70. We are thinking of doing a flush and putting in half strength nutes. Is this the right thing to do?

 

[BuddroGreen]

What are you using for pH down?

What nutrients/supplements are you using?

What tds/ppm are you feeding them?

That RH needs to come down to 35%-50% in flower, it will help keep the Powdery Mildew/Mold/Bud Rot away.

A rising pH is normal when you have a healthy growing plant, if you set it @ 5.9pH, try to lower it to 5.5pH, and when it rises above 6.5pH, lower it again to 5.5pH.

 

[GardeningGram]

ph down is Wild Thing. nutrients are LR, MA, MB, MM & BB. ppm is 251. Is it beneficial to Flush, bring down ph, then half strength nutrients at this stage?

 

[GardeningGram]

Ended up doing a flush and half strength. The girls look happier - thanks for your help Buddro Green!