EC stable PH dropping RDWC

Hi everyone, I have a problem with my PH level. Running Rdwc multiple buckets, 7 weeks into flower ( 10 week strain ) res temps under 19 degrees C. Ec 1.4 ( tap water 0.4 ec) I have air stones and recirculating pump.

basically I mix my water and nutes in a tank, set the ph at around 6.0. EC at 1.4. Then fill the system. Within 48 hours the ph level reads around 4.8 / 5.0 With the EC steady at 1.4

Bud growth has slowed and have some yellowing leaves as I have had this problem for a couple of weeks.

Any ideas? thanks!

You didn't say what you are mixing.
Advanced Nutrients has done that for me; 6.5 when I mix, 4.8 next day then later goes up to 7.3. They replied that their nutrients are designed to work like that.

Sorry, using mills nutrients. Keeping to this chart, except my ec is never as high as they say on the chart.

You'll get the best answe from Mills Nutrients if you call or email them.

Same thing here,what Ive been doing is pump out half the water and refill with nutes and no ph down.Seams to be that as they get older they require less ph down.I use to use 90ml and that wasnt enough in my 120 L system.Now it takes 30 ml ph down.I feed at 1 ec.Ive read that as plants use up phosphorus it drops ph and when they use up nitrogen ph goes up?Again just what Ive read.

Also smaller reservoirs don't hold ph well at low doses but apparently the sweet spot is going to go between 5.8 to 7.3 and like myke said you find a style maintaining the reservoir without using ph down is recommended.

Rheaun said:

Also smaller reservoirs don't hold ph well at low doses but apparently the sweet spot is going to go between 5.8 to 7.3 and like myke said you find a style maintaining the reservoir without using ph down is recommended.

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7.3? way too high 5.7 to 6.2 is the sweet spot for hydro

7.3 is acceptable if you use the right nutrient I suppose.

larrypizzimp93 said:

7.3? way too high 5.7 to 6.2 is the sweet spot for hydro

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Haven't you seen the nutrient solubility charts that show experimental hydroponic range to be that high.

root rot?
nute lockout?
yellowing can be normal or it can be a sign of a problem

I'm guessing if you ask Mills Nutrients they'll say to use enzymes.

Saw these somewhere. Maybe someone with more experience can verify its actually correct

THEit said:

Saw these somewhere. Maybe someone with more experience can verify its actually correct

Click to expand...

See if your chart matches up to this popular chart.

THEit said:

Saw these somewhere. Maybe someone with more experience can verify its actually correct

Click to expand...

Static ph isnt good either,week 7 I would flush for 24 hrs then reset at a lower ec.