PPM slowly rising

chadgApril 9, 2008

Is it normal for the PPM to slowly rise over time?

My lettuce has been in my floating raft system for about two weeks now and the pH has stayed nice and stable around 6.8 but the i have noticed the PPM is slowly rising.

pH over the last two days has dropped just a tenth or so i will check today and see if my pH is slowly dropping also.

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AndyA(6 Indiana)

Evaporation??

    Bookmark   April 9, 2008 at 5:25PM
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chadg

I would guess that i have lost about 1 gallon out of my 7 gallon tubs. That might be it.

I was not sure if the plants would make the PPM go up or down over time.

Thanks for the response, i will keep an eye on it and i might swap out the water this weekend.

    Bookmark   April 9, 2008 at 6:40PM
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