PPM increasing?

Is it normal for my ppm's to increase through out the week, with out me adding any additional nutes? My PPM starts around 850 when i make a new batch on sundays and then by Thursday its sitting around the 1000-1200 mark? Has anyone else expirenced this?

It's normal. It's from the plants perspiring the water out of the res. That makes the PPM concentration higher. You can just add fresh PHed water to keep the PPMs constant.

thanks man!

That's good to know shafto, I haven't got my dwc running yet but this would have confused me too, so +rep now i know in advance

YOu just have to top off meaning you just have to add water every day.. In flower they will start drinking 1 gallon a day .