tap water ppm question

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a44

Member

• Aug 27, 2009

• #1

tested some fresh tap water straight out of the faucet, ppm = 55. tried testing some tap water that has been sitting in a plastic bin for about 3 days, ppm = 75. does this make sense? shouldn't the ppm be going DOWN as chlorine and other chemicals evaporate from the water? also, considering it's city water, shouldn't the ppm be higher? read a lot of threads with people saying their water was a few hundred ppm straight out of the tap.

will calmag plus be needed??

thanks!

 

doc111

Well-Known Member

• Aug 27, 2009

• #2

a44 said:

tested some fresh tap water straight out of the faucet, ppm = 55. tried testing some tap water that has been sitting in a plastic bin for about 3 days, ppm = 75. does this make sense? shouldn't the ppm be going DOWN as chlorine and other chemicals evaporate from the water? also, considering it's city water, shouldn't the ppm be higher? read a lot of threads with people saying their water was a few hundred ppm straight out of the tap.

will calmag plus be needed??

thanks!

Click to expand...

Chlorine is not a dissolved solid. I am not sure why ppm would go up though???????

 

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angelsbandit

Well-Known Member

• Aug 27, 2009

• #3

Water evaporates, - dissolved solids stay - PPM goes up.

 

doc111

Well-Known Member

• Aug 27, 2009

• #4

angelsbandit said:

Water evaporates, - dissolved solids stay - PPM goes up.

Click to expand...

Duh...Makes total sense.

 

hater hurter

Active Member

• Aug 27, 2009

• #5

plus, tap water depending where you live may come out as low as 0. where i live the water from the tap is as clean as bottled water. course, here we have underground wells. my ppm straight from tap is around 12ppm

 

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a44

Member

• Aug 27, 2009

• #6

ok thanks... so then should something like calmag+ be added? have read that ppm should be around 250

 

hater hurter

Active Member

• Aug 27, 2009

• #7

don't know, but i'll bump the topic with hopes someone who does know will see it now.

 

Foolieo

Active Member

• Aug 27, 2009

• #8

sry for the noob question what ppm to you want to keep you water at?

 

MostlyCrazy

New Member

• Aug 27, 2009

• #9

Shouldn't need cal-mag with a ppm under 200. My tap is 350-375 and you def need it then. Plant can't digest the big chunks and cal-mag is like the baby food version (chelated) and helps you avoid defiencies.

Foolieo,

You want your water as close to 0 ppm as possible but anything under 1125-150 is fine in general. Reverse Osmosis (RO) water is close to if not at 0. Remember to subtract the ppm of your water for the right ppm number of your total nutes when comparing charts.