EC stable PH dropping RDWC

R

Ripstick

Member
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!
 
Rheaun

Rheaun

Member
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.
 
myke

myke

Well-Known Member
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.
 
Rheaun

Rheaun

Member
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.
 
larrypizzimp93

larrypizzimp93

Well-Known Member
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.
Click to expand...
7.3? way too high 5.7 to 6.2 is the sweet spot for hydro
 
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