Spiking Ph...

[irieluv]

So I was wondering, I am using a flood and drain with rockwool, 4x4 tables with a 40 gal res's.. My ph spikes every day, I check it twice a day and every time I am taking it from at least 6.5 down to 5.7.. Anyone got any idea's why it's spiking... I know it's suppose to creep up but not spike a whole point up.. don't most hydro sys's maintain a steady ph? thanks for any help...

[Infamous 1]

How big is your res? If your plants are big or if you have a lot of plants with a small res and the plants take in a lot of water ph spike can happen. This is just one way that it could happen... Hope this make sense and helps.

[GigZ-16]

If your adding any nutes to the res, maybe their pH is throwing it off.

[TToken]

what kinda water u usin

[irieluv]

carbon filtered tap

[bud_wiser]

rockwool has a high ph so you have to take that into account and check your roots.could be a sign of root rot. what is ur res temp? is ur res well oxygenated and lightproof?

[irieluv]

Yes, it is.. and there is no root rot, I think it might have been due to a lack of nutes.. the nutes that were there where getting eaten to fast thus lowering acidity and spiking the PH.. But I'm not sure yet, still feeling it out..

[AugustWest]

did you soak your rockwool in 5.0 PH water overnite?

[irieluv]

ya dude this is just my flowering room that does this, my veg room is where I soak them and veg them without a ph spike for weeks, this only happens in the flowering res's...

[BioloGyMaJor]

its probally your nutes