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Ec of run off is really high but plants look good?

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So I'm using ghsc powder feeding in soil and really liking the powder feeding so far. Plant look really health and no nute burn, which is normally my problem. The other day I thought I should check my runoff ec to see if I needed to feed more or less. The ec was off the scale that my meter can read! So now I am worried! The plants are about a foot tall and I am just about to switch into flower. Any help would be really appreciated

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Powder feeding is not my area, I have not used it.

Have you checked your calibration on your meter with calibration fluid?

Please provide some more info for others who have used it, so they can answer more acurately.

Type of grow are you doing Soil, Coco or Hydro ?

Which Powder feeding are you using?

What ec are you getting?

Are you following the advice feeding regime in the leaflet? eg correct dosing?

Link to powder feeding leaflet - http://www.powderfeeding.ch/store/downloads/PowderBrochure_EN_WEB.pdf






Most growers use synthetic feeding to grow cannabis. This is mostly because synthetic feedings are ready-to-absorb, work fast, and are easy-to-dose. Nevertheless, compared to organics, there is one single main disadvantage: salt buildup in the medium. As a consequence, flushing the medium where cannabis grows should be seen as a natural, logical, unavoidable step to maintain a healthy, productive crop. A clean growroom, and clean tools, are just the beginning. It is also important to keep clean the environment where the roots grow, the medium. Roots develop in a dark, wet environment and are prone to absorb fertilizer if certain conditions are met. It does not matter what kind of medium is in use, synthetic fertilizer will cause salts buildup and intoxication of the plants, if proper flushing is not applied. During the crop, fertilizer gets absorbed by the plants in different quantities and concentrations, depending on many factors (temperature, pH, metabolism, mineral composition of the fertilizer). The plants intake feedings, and the leftovers sit in the medium and crystallize into small rocks of salts. This causes an increase of the medium pH and EC, and intoxication of the plants.
Flushing the medium is a tailored procedure, one that varies according to the type of medium.

In earth, salts build up at a slower pace than in hydroponics, but it is also more difficult to wash them away. Once the fertilization program is under way, it will take 3 to 4 weeks for salts to start building up, and another week before it can do any harm to the plants. Therefore, it is advisable to start flushing plants that are growing in earth around week 5-6 of the cycle.

When flushing, it is important to avoid over-watering; this means that the flushing should be integrated in the watering cycles. Before the flush the medium should be fairly dry, and after flushing it is very important to let the medium become dry and light before feeding or watering. The dry-wet-dry-wet cycle in the earth (sponge-effect) is what maintain the plant metabolism at optimal levels. For plants growing in soil, the flush is very important at the end of the crop, during the last 2 weeks before harvest. If properly flushed, plants will produce tastier buds, and the combustion factor of the dried material will improve. If plants are not flushed properly, combustion is slower and the flavor poor, and artificial.

When flushing the medium, it is very important to be organized to avoid water spills in the growroom. The purpose of flushing is to wash the medium, and as a consequence a lot of water flows through the containers down to the ground, and it is very important to drain away excess water from the growroom, so the climate stays good (too much water in the room will cause air humidity to climb fast, creating all sorts of issues). The easiest way of flushing is when working with elevated tables, and proper drainage pipes. Another way of effectively control flushing

In hydroponic mediums (from rock-wool to pebbles to coco fiber) the flushing process is easier to implement, because there is a higher degree of drainage. The texture of hydroponic medium favors flushing, and it is also more necessary than in earth.
When flushing hydroponic medium, it is very important to be exact with the values of the flushing solution. EC, temperature and quantity are very important factors. The EC of the flushing solution must be high enough for the salts to bind with the solution, but not as high as to form more salts. The ideal values are between 0.9 and 1.1.

The temperature must be in the 20-24 degrees Celsius range, to allow salt crystals to dissolve and unbind from the medium. If the temperature of the flushing solution is lower than 20 degrees the salt crystals will not dissolve, and if it is higher than 24 degrees the tiny root-hairs will be damaged.

And finally, the quantity of solution going through the medium should be at least double in volume (for example: 40 liters of flushing solution for a 20 liters container). In my personal experience, flushing with up to 3 times the volume is even more effective, as long as the drainage is quick.
Flushing is best done at the beginning of the light-cycle, so to favor evaporation of excess water and to let the medium begin the drying process faster after flushing.

Once plants are flushed, they tend to get lazy, and slow down growth for a day or two, but this is all part of the game. As soon as the medium dries again, the growth (or ripening) resumes fast, and even increases.
To double check the effectiveness of flushing, it is easy to measure the values inside the medium before and after flushing. First, pour some flushing solution through the medium. Measure the values inside the first liquid draining from the bottom, then apply the complete volume of flushing solution. At the end of drainage, measure again. At this point, the pH and EC readings of the flushing solution should be similar to what is draining out of the container.

In conclusion, flushing should be part of any synthetic feeding schedule, well integrated in the process. Water tanks capacity, and drainage, should be priority considerations when designing or building a good growroom. It can only improve the results of the grow operation.

Franco @ Green House Seed Co.


Hopefully someone who uses powder feeding will be along soon. ;)




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3.2 isnt that high.. thats around 1800ppm.. give or take.. so probably a little high but just inside parameters .. just water every 3rd time with power feed, the other 2 times just water with PH adjusted water.

The leaves should tell you if the plant has a problem, and if they look fine.. then no problem..

if youre entering flowering stage.. then just use plain water for the next few feedings, then swap to flowering solution..

a pic would be good...

but it seems to me everything is ok..

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SukonmiSkunk, I think what Cheeky was Saying is "His EC meter maximum reading is 3.2, When it is flashing it is showing that the reading is beyond the range of measurement".


A flush sounds right, Read and follow Franco's advice on flushing, I posted it earlier in this thread.


Here is a chart showing the different types of readings from different meters.

As you can see there are  different PPM conversions  for EC 3.2 depending which measurement you use.



Here is the sheet for hybrids from the Powder Feeding brouchure

(Click image to enlarge)





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Did you feed her every watering until now or every other watering?


but all in all, the only thing you can do is what the guys suggested above :) a good flush and little lighter hand o nthe feeding ;) some little pics of the plants would help to see if she is near beeing overfed or if she just look normal :)

Have a good day man

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