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Old 09-14-2017, 03:36 AM #1
Mtez44
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Rapid Ph rise

I got 16 - 5 gal buckets under 4kw led's. they are going to be 4 weeks old on Saturday. I'm at about 300ppm solution, from tap water and general hydro nutes. They are rooted in coir pucks buried in clay pebbles in an 8" net pots.

I changed the water/solution yesterday 9am. Nuted to 300ppm and ph'd to 5.9. 36 hours later the solution in the buckets are at 7.3-7.5 and I don't know why the rapid spike.

Is it due to the chlorine evaporating from the tap water? Should I let the water sit for a day before I make my solution? Any help would be great.

P.S. I have a high end inline water filter arriving tomorrow and will be installed asap. Solution change immediately after
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Old 09-14-2017, 03:53 AM #2
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What was ppm reading when ph spiked? Nutes will lower ph and and the plants eat its normal to see ph rise. Did they just eat it up? If so this could likely be sign of hunger and desire for higher ppm feeding potentially.
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Old 09-14-2017, 03:57 AM #3
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If you got algae in your buckets it'll spike the ph like that.
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Old 09-14-2017, 04:10 AM #4
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How do I tell if I have algae? I see nothing with the naked eye.

I never though of it that way. I guess they could be hungry and just be depleting the solution. I will check PPM tomorrow. If it's low should I change water and replace with a stronger solution?

Again, everything looks nice and healthy so far.
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Old 09-14-2017, 04:39 AM #5
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What was ppm reading when ph spiked? Nutes will lower ph and and the plants eat its normal to see ph rise. Did they just eat it up? If so this could likely be sign of hunger and desire for higher ppm feeding potentially.
This here...

Most *problems* in hydro cause a drop in pH. Rises in pH are generally caused by nutes being used up or too much air being pumped through the water.
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Old 09-14-2017, 05:07 AM #6
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Algae will be visible. Ive seen guys get it in their rockwool.

Some raise ppm by adding nute or concentrated nute solution to control. Others do full swap.

Some dont swap out nutrient solution whole grow. Some do it weekly.

I have done both. I like regular swaps because you have more understanding and control over composition of nutes and what your ppm represent. Nutes aren't so expensive that its cost prohibitive to do this. Yet some swear by never changing out and only topping off

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Old 09-14-2017, 05:23 AM #7
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Is that carpet? Consider laying down tarp or plastic next time first or between rounds. Also consider insulating buckets and tubing. Reflectix at home depot works well and foam tubing insulation is cheap
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Old 09-14-2017, 05:52 AM #8
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What is the ppm of your water that you are starting with? I ask because if you are using tap water there is most likely an amount of some stuff in the water giving you a starting ppm level of the water and if your ppm's with your nutrients are only at 300ppm's you may have your solution too weak.

Have you tried readjusting the ph of your nutrient solution/water since the ph went up?
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Old 09-14-2017, 06:56 AM #9
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Quote:
Originally Posted by gh0stm0de View Post
What was ppm reading when ph spiked? Nutes will lower ph and and the plants eat its normal to see ph rise. Did they just eat it up? If so this could likely be sign of hunger and desire for higher ppm feeding potentially.
I agree. Ph will rise quickly if the plants are feeding heavily in veg

PH swing is good, plants uptake different nutrients at different ph levels

I said fuck the ph meter long ago. The plant tells me what it needs, you just gotta learn to read the plant
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Old 09-14-2017, 10:29 AM #10
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Tap water = bicarbonates.

Bicarbonates = alkalinity

Alkalinity : https://en.wikipedia.org/wiki/Alkalinity

You hydro guys should now this, it's just basic for any grower. Ph will rise up in some time (minutes-hours depending on the hydro system and other things), till saturation it's reached. Than pH don't fluctuate anymore this big, just little swings at max.
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