if i start w/distilled water w/appm of 0.00 and once i ph it it jumps up to 140-180 already. do i just sutract this from my ppm reading? or if i start with tap water that has sat out for 72hours i have ppm of 280ppm also is this subtracted from total. and tell me if im wrong but 400-600 ppm is per liter ?I use gallons so this equates to 3.78 liters x3=for three gallons and im at 11.38 litersx600ppm=6828 total ppms per 3 gallons.so approx 2276ppm per gallon ppm+ what i start with as far as ph ing water distilled vs tap which is up there at 280ppm im way off are'nt i? help!!!!

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spacekamp

PPM is parts per million.
nothing to do with liters or gallons.

The PPM is what your nutes should be,
between 500 and 1500 depending on the desired ppm.

I don't know what nutes you are using,
but you need to look at the directions.

It should give you a dosage in ml/liter or teaspoons /gallon.

I use ml/gallon just to make measuring easy.

Looking at my bottle of AN Connoisseur,
it shows an application of 3.3 ml/L

This is 3.3ml X 3.8 = 12.5 ml/gl

I have an 8 gl rez,
so I use 100ml,
and get a ppm of 1000,
starting with 000ppm water.

300ppm of nutes is = to 1ml/liter
1ml x 3.8L x 8glrez = 30.4ml

If my water was 300 to start with,
I would use 3.8ml/gl less,
or 70ml total nutes for my 8 gl rez,
to get a finished rez solution of 1000ppm.


.

Thanks earl i was just reading that what you had wrote on another forum anyways i guess i need to do the ro if i really wanna do this right. my ppm meter only goes up to 2999 ok earl im an idiot im confused after i measure a sample of my water with nutes and phd its like 1900 and im into week 2 yikes where im confused is does ppm add because if i add 3gallons together ppms are out there so how do i measure my res which is 4 gallons and one other question my res level is above the netted pots i need to drop this below thepots? i think thats what you were saying on the other forum thanks

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spacekamp

im using the flora series for nutes

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spacekamp

You need to flush your rez,
and get the ppm down below 1000.

You are going to fry your plants with 1900ppm.
.

but im using 1/2 nutes as it is and there only 11days old and they look really good see thats where im all screwed up earl doesnt ppms add so if you figure 400ppms for 1 litere of water of nutes and you have a 3 gallons doesnt that all add? its 400ppms of nutes per liter right

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spacekamp

pics no yellowing just a little bueish tinge on like one of the plants and its going away and do i need to lower my resovoir fluid to below my pots?

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spacekamp

i wouldnt be able to add any nutes w/ that formula using tap water at 280ppmper gallon x 3 and im at 840ppm without nutes or evenph dropping the water because that adds 140ppm per gallonx3=420+840 and im at 1260ppm without nutes so i either deplete the plant of nutes or do the ro which really seems like the best way to keep track of ppms. by the way my avatar was grown the same no yellowing im not doubting you i just dont think i fully understand you

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spacekamp

i think im talking to myself now

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spacekamp

stop making this so hard, PPM = Parts Per Million. So if you have a liter at 240 ppm and you add it to 3 other liters of 240 ppm, you still have a 240 ppm solution. Because you have increased the total volume of both the water and the nutes in the same ratio. Did i make that clear enough? Good luck