Originally posted by FlyingDutchPaddy
View Post
Tuesday 20180618, change all the water day... receive TDS meter day 
TDS meter is NaCl (salt water) factory calibrated to 342 ppm
2 measurements before the water change: pH & ppm.
Before changing water pH measured at 5.7
Standard tap water ppm = 244
So, change of water details:
Quantity = 45 L
3x 15L , per 15 L measurements were:
micro - 30 ml - ppm 596 - pH 7.3
Bloom - 60 ml - ppm 737 - pH 6.3
CalMag - 30 ml - ppm 669 - pH 7.4
After adding all 45 L to res & buckets,
average ppm = 645
average pH = 7.5
waterpump & air stones on for 10 mins;
ppm = 653
pH = 7.5
Added 8.5 ml pH down, let it circulate for 30 mins.
ppm = 650
pH = 6.5
Resting pH after plants were put back in at 20:45 - 6.7
Will see what happens overnight...
TDS meter is NaCl (salt water) factory calibrated to 342 ppm
2 measurements before the water change: pH & ppm.
Before changing water pH measured at 5.7
Standard tap water ppm = 244
So, change of water details:
Quantity = 45 L
3x 15L , per 15 L measurements were:
micro - 30 ml - ppm 596 - pH 7.3
Bloom - 60 ml - ppm 737 - pH 6.3
CalMag - 30 ml - ppm 669 - pH 7.4
After adding all 45 L to res & buckets,
average ppm = 645
average pH = 7.5
waterpump & air stones on for 10 mins;
ppm = 653
pH = 7.5
Added 8.5 ml pH down, let it circulate for 30 mins.
ppm = 650
pH = 6.5
Resting pH after plants were put back in at 20:45 - 6.7
Will see what happens overnight...
to be clear once more, in Hydro, never let your PH stray outside of 5.5-6.5. It’s a shock to your root PH to take them out of 5.7 water and throw them into 6.7 water IMO
Comment