sealed room

[Row]

If the ppm never goes below 800 with out you in the room or any added co2 or draw of fresh air then id check the co2 reader....

 

[shuswap]

i was over there this afternoon and he said he has gotten it down to 500 last night with a little venting,the co2 controller how are u able to check them?

 

[shuswap]

philthy what does your co2 level go to at lights out with small plants in the room?

 

[Row]

500 is about right for the night time co2 ppm, even just a little ventalation makes the difference. You just dont want none..

To check your co2 monitor just take it out side and it should read about 350-400.

co2 should be off during the night so the level in your room should be close to atmospheric (350-400)