after a few weeks at 500-600 ppm better .. so I think the limit was 800-900 ... for a short time ... then it should be re-established or check often and it will keep at the desired level but above 1000 ppm 2000us / cm ... and too much ... a starting Aqua 100-200 ppm max and ..Stop little reflection., ::: ::: unfortunate for extreme heat ... how will we do if the temperatures do not decrease .... greenhouse effect .... the cultivationabove 1000 ppm 2000us / cm ... and too much ... a starting Aqua 100-200 ppm max and .. unfortunate for extreme heat ... how will we do if the temperatures do not decrease .... greenhouse effect .... the cultivation Indoors it pollutes .. and I too .... We should put solar panels ... Guys there are so many a war will happen if we do not evolve together with the planet .. ...