Reliable PPM Chart for Marijuana

Hi i found the chart below which im going to paste. (thanks to Roseman posted elsehwere LINK HERE.
My question is this, my water PPM after i stabelize the water with PH Down, the PH is about 5.8 and the ppm reads 600.

so if the PPM reads 600 of my water before adding nutes, i would subtract the 600 from the nutes i add? so if it reads 750 that means 150 nutes in water?

and also isnt 600ppm water high or something? should i use filtered water instead?

BTW I have a HI 981404N
pH/TDS Indicator for Agriculture with Range up to 1990 ppm (mg/L)

thank you!


PPM for Hanna Chart PPM


Seedlings, Early Sprouts 100 to 250

Early Vegging 300 to 400

Full Vegetation 450 to 700

Early Blooming 750 to 950

Full Mature Blooms 1000 to 1600

Note: EC Calculations are different, here's a conversion chart :
heres a great chart that shows how different PPM can be from meter to meter... EC is the only real universal language...

Remember to discount the ppm of your water.

Not recommended to grow in 600 PPM water, problem is 600 PPM of what. By his not at the bottom it seems he is telling you to ignore the PPM of your water but I use my water PPM in my calculations.. So I start with 20 and I want 700 PPM then I will add 680 PPM, my actual PPM is 700.

ah, your right. just when i thought everything was almost ready lol i guess ill have to buy filtered water, i tested the filtered water and it is 140ppm and 8.0 ph

i cant believe how hard my tap water is! crazy

do you have a ppm meter and if so, does it change the ppm fast after adding the nutes to the tank and mixing it up? how long does it take to stabalize 5 min?

thanks for your help!

hey i just noticed , i added some PH down liquid to bring down the ph from 8.0 to 5.5 and the ppm went from 140 up to 320ppm is this normal?

It is instant as soon as you add nutrients and stir the PPM will be risen. If you meant how long does it take for the meter to give you the correct reading, I use a cheapie and it takes about 10 seconds. That PPM rise seems like a lot, it is normal to have your PPM rise a little when you add PH down but that seems like a big jump. I see 50 PPM dropping from 8.0 PH RO water to 5.8 but that is after adding in the nutrients first, nutrients do drop the PH for you too.