This is the best assumption. Without doing a water test there is no way to know 100% for certain. And paying a company to test your water is an additional cost that seems to outweigh the benefit for the average home grower.
Awhile back I found a good thread about estimating Cal & Mag based on water hardness. It was on a different site. If I find it I will link it to you. From what I remember the ppm is mostly calcium carbonate with a small % of magnesium. The amount of calmag in the water is fine for some strains, but some others may need supplemental calmag if deficiencies are appearing.
It sounds like you’re looking into something that had me stumped for awhile early on this summer haha 
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You could water to runoff and test that.
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Yea man i thought i figured it out last year but now i will keep supplement magnesium for sure. Theres definitely some calcium carb in may tap water so i “should” be good on calcium. Gonna focus on mag and see how things go
Ooooooo thats the part where the trellis stops me in my tracks. The 5gal pots fill the saucer they sit in from edge to edge so there is no where to collect run off 
arghhhh i might have to ride this one out
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I’ve been sticking to using mostly Epsom salts for extra magnesium (also adds some sulfur). The medical grade scent-free kind is only a few dollars at almost any pharmacy.
Sometimes I also use a tiny bit of Calimagic but I haven’t figured out if it does much to help.
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Yea im gonna be adding epsom salt and watching new growth. Im not sure what is a good ratio of epsom salt per gal but i did a couple teaspoons into 2 gallons on their last feed along with some microblast which has a decent amount of water soluble magnesium. I dont think that shit organic tho
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That shit is organic 
sulfates and kelp…
Almost looks more like phosphorus to my eyes. I didn’t look up every product in your last feed but does anything from your feed list have much P? I didn’t see anything jump out at me.
Edit: may also be potassium. I think it’s a macro thang. Normally you’d see it on lowers first but it’s what it feels like to me.
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O hell ya i love when that shits organic 
I wasnt sure cause it didnt have the omri badge
When i did my soil test for my flowering plants before flip the soil was very depleted and only contained phosphorus. Then i started adding 4-4-4 to boost N and K. Flower tent is doing fine besides looking a little over fertilized on one plant.
So i took that and went to my kitchen stinks and figured hey they aint far off from depletion either (i did not do a soil test) and i began adding 4-4-4. I added 4-5 shot glasses of 4-4-4 to each 3 gal pot and began watering. I have to check my notes i believe i was feeding on top of the 4-4-4.
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Whats so odd is that my lowers look amazing. Im pretty stumped here but if you go back i definitely ran into these exact issues in the past. Once i conquer this shit i should be moving on to next level quality hopefully
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This og melon breath is wildin
Rut roh water only!
Purp setting in… well find out of its a good or a bad sign
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The weekend is here!!!
Flip day for kitchen stinks! They are maxed out and out of room in the 2x4. I pruned them pretty decent yesterday since they are going in a small section of the flower tent.
All my legion sour ogees, og melon breaths, and wifos will now go into the 2x4 and will hopefully have some room to stretch out. In reality there is 9 plants going in a 2x4 so i probably will run out of space pretty quickly.
Happy Friday yall!
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I love buying myself presents!
More 5gals baby!
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Guys my plants are fuckin thick as hell!
Day 21F. I am trying to defoliate them but its like getting a hoarder to clean his house…
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I feel like they are gonna get hungry and need these leaves so i am going to pull a few more n thats it
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Okok this is all youll get from me!
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KITCHEN STINK DAY 1F
Ok but seriously after putting the kitchen stinks in the flower tent i am really worried about mold…
…then again im always fuckiin worried. Thats why i smoke pot haha😂
I have an inkbird just over the canopy set to 45% rh and the dehumidifier kicks on when rh rises to 49%. Also have a box fan on low setting hung from ceiling of tent and tower fans.
I chopped hella branches off of the kitchen stinks cause there was no way they were fitting. Getting a bit overwhelmed here but i am gonna push through!
Wolf cap gettin frosty
Oh yea and were gonna make some bubble hash with fresh frozen this round
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Looking at the veg tent now and im wondering how the hell am i gonna fit all these plants into my 5x5 in 2 months!?
Also just fed all these 1.5-2cups
1gal mix 5.9PH ??? EC
5ml fishmix
15ml labs
BTI
5ml activera
2ml microblast
Hopefully we get the wolf caps and gelatos out of there in the next 5 weeks. That will give me room to breath
Aw man its early and im stoned! I forgot 2 of those are males and are getting segregated from the females. That lessens the 5x5 load for sure!
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Profile pic mission is a officially a go!
I had to draw this up for some graphic designer since explaining it wasnt too helpful. Hopefully this paints a picture of what i want!
So what we have here is seed 
sprout plant plant full of buds guy smoking a joint in chronological order! No that is not a ghillie suit!
@Mr.Christmas thanks for telling me about fiverr bro! Endless artists for hire
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Graphic designer told me $500 that’s fucked… profile pic mission over
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Just walked my dog to our favorite field, where I unleash him and somebody else is walking their dog there so we had to settle for the crappy field and then to make things worse. I got this electric lighter and it fucking died on me as I go to light my joint.
Faaaaaaaawwwwwkkk man i was ready to burn one !
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