ph keeps dropping

[Chris2302]

PH keeps dropping but the EC stays the same help.

[Toker1]

Dropping overnight? Or dropping over a period of several days?

[Chris2302]

Dropping over night, every night .had changed the tanks to try and resolve but nothing seems to be working and plants don't look well.

[Toker1]

Is this a new system? Maybe some plastic that has never seen hydro nutrients before this? A new system can fluctuate PH like that. Another issue might be that the girls are drinking more water and using less nutrients. That would cause PH to drop. What have the reservoir temps been like recently?

[RagWeedDWC]

And has the temp been consistent or is it dropping also.? (Was my problem and was the last thing I checked :-))

[Chris2302]

They are in flower o temp drops at night when lights off.

[Chris2302]

No it's not a new system, temps are ok in reservoir but girls do look sick and not developing as they should.

[Toker1]

I shoot for 68F inside the reservoir. Anything over 75F can cause issues.
What has changed since before these issues started occuring?

[9fingerleafs]

do you use ph down?

[Chris2302]

Been this way since I changed from soil to NFT.
Don't use pH down if it's dropping.

[9fingerleafs]

whats the ec? just trying to think what could be causing it, you using air pumps or relying on the re-circulation? how do the plants look?

[9fingerleafs]

also what kinda nutrients you use? haha i think you should give us as much info as you can, lack of info is the main reason people dont get involved, its a shot in the dark trying to guess

[Chris2302]

Shogun food, boost and bigbud when it's required,13\14 etc EC is 19 plants look sick is not growing and yellowing leaves.relying on the circulation.

[RagWeedDWC]

May be my bi focal's but is that a EC reading of 19 or 1.9?

[9fingerleafs]

And what about the water level. Are they drinking? You said EC stays the same but if water level goes down then the plants are indeed drinking. If not then the problem has reached the plants. Either way i personally would blame lack of oxygen. Oxygenated water is more basic, it could be the reason the ph is dropping. How much is it dropping? You use a ph meter or drops?

[Chris2302]

Water level is dropping, ph can drop from 6.4 to 5.4 in 24 hrs ,using a brand new meter that has been callobrated.

[Toker1]

She is drinking more water. Must be thirsty. Have you seen any signs of root rot?
What is the current water temperature inside the reservoir?

[9fingerleafs]

That’s a great sign. Means possibly one of your nutrients is being consumed in less proportion than the other nutrients and the water. Hard to know what nutrient you should lower but usually the macro nutrients are the most acidic

[Chris2302]

Don't know if I am doing right thing but have decided to empty tanks then flush with pH adjusted water then refill .

[Toker1]

Yeah, that’s all good. Make sure to wash those roots off really well.

[Chris2302]

Cheers, hopefully this works.