My ppm in my water is 50

Do I have to add calmag to my water between 500-600ppm?? (First week of seedling)

1st week seedling dosent even have roots yet to speak of…

Depending on what you’re growing in, you may have to add anything for a month.

Seedlings need no nutrients. Depending on what soil you are using you may not need to feed anything for 4 to 6 weeks.

@borderryan @Audiofreak @MidwestGuy coco coir medium

Below is what we call a support ticket and if you answer these simple questions the best you can many experienced growers can help you.

If you do not know, or do not use something; Just say so; Or post
NA (not applicable)

-What strain, Seed bank, or bag seed (photo or auto):
-Age of plant:
-Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF
-Vessels: Type and capacity of container (fabric, plastic, etc)
-Nutrients: Brand and feeding frequency/concentration
-PH and TDS of Water, Solution, runoff (if applicable):
-PPM/TDS or EC of nutrient solution (if applicable):
-Method used to measure PH and TDS:
-Indoor or Outdoor if indoor, size of grow space:
-Light system List brand and wattage/spectrum:
-Actual wattage draw of lights:
-Current Light Schedule:
-Temps: Day/Night
-Ventilation system: Yes, No, Size
-AC, Humidifier, De-humidifier (if Applicable):
-Co2: Yes, No

If growing Hydro some additional questions:

-DWC? RDWC? Autopots? Ebb and Flow? Other?:
-Distance of liquid below net pot (DWC):
-Temperature of reservoir:
-TDS of nutrient solution:
-Amount of air to solution:

Always try to upload a clear picture in white light of any issues you may have.

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I haven’t grown anything in coco yet. Starting next month. The grow ticket will help a lot just copy, fill out and paste. Sorry, wish I had more to share on it.

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Okay. Coco is a bit different and I believe you start feeding when in coco when the cotyledon (little round first set of leaves) start yellowing. The cotyledon leaves provide all of the nutes a plant needs for the first several days of a plant’s life.

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If u are using coco coir u will have to give them a little bit of nutrients as coco coir doesnt have much nutrients at all ,this is what works for me i use seasol power feed i put 1.5 mls to 2.5mls in one litre of water then i water the best thing is that one litre will last you the week cause u dont have to give to much water to a seedling ,but like i said thats what works for me thou i dont know what nutrients your goin with whether ur using bottled nutrients ot dry amendments

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PPM is a measurement (how much). Total Dissolved Solids (TDS) is the minerals in your water (what). You need a water report to tell you what is in your water (TDS) vs a measurement of how much it equals (ppm).

Normally, the municipality can provide that information for you. If you’re on a well you’ll have to get your water tested by a lab. They’ll sell you a report.

Once you have this information you can determine what you need to supplement. …but bottom line the plant will tell you what it needs regardless of what a bunch of numbers on a page says.


Did you purchase pre buffered or buffer your coco prior to planting in it? Your plant will be fine while it has cots, but your coco may leach nutrients if not buffered properly and fed regularly.


Your tap water is that high? I’d be worried about what is already contained in that water. Personally.

Those are my well water ppm levels. I RO it. My well water has ppm that high from nearby farm runoff. Causing it to be too rich in nitrogen for use with almost any fertilizer. So I reverse osmosis filtration with deionization.

My salinity ppms are never above 1000 entire grow. (800-950 entire grow, with jacks, note this is salinity not tds, salinity is a good place to start when testing base water for your nutrients)

As high salinity is what will cause most damage with almost any nutrient line.

How do I test for salinity vs tds? I only have a tds meter

You would need a meter that measures salinity, EC or a refractometer. EC tells you salinity same as tds… Most tds meters have an ec settings…

" Likely the best aspect of using a salinity meter is that it automatically provides you with salinity readings. While conductivity sensors can help you obtain salinity measurements, they don’t provide exact readings of salinity. Instead, they measure the conductivity of water, which refers to how well the the water passes an electrical current. Because conductivity readings focus on the amount of total dissolved solids that can be found in water, high conductivity readings also indicate high salinity measurements."