Fullgas

Just been playing about with a DIY co2 generator with sugar water and yeast considering paying out for a better system and meter but at least I can still monitor to a degree but I don't think this co2 meter is up to much cop...... I've made a co2 bucket with an air pump still using sugar yeast 2x tomatoes and a potatoe puree'd 1x teaspoon active brewers yeast and 2.5 liters of water in a 5l bucket with sealed lid ratchet strapped shut sat on a 20cm square heat mat set on a thermostat at 24c to 27c temps sits about 26c for a prolonged co2 release levels have defo increased spiked quite high then settled approx 1200 to 1500ppm or the meter is wank but either way its adding co2 just for how long though ? I've read up on the fungus method which last 6months so I'll be sorting that soon