2x2 Humidifier

Thanks @seedlockHolmes . How much moisture does your dehumidifier collect each day approximately? Would i need a small cheapy that collects 400 - 600ml a day or would a bigger 1-2 litre a day extraction be required?

I've seen people taking out the reservoir of small humidifiers. Usually there's a button when you fit the reservoir back in that's a safety button so that the humidifier doesn't start without the reservoir. If you plug this button in with tape the humidifier will work without reservoir. You can then connect the water exit to a bigger reservoir and . Usually the dehumidifiers have a different operating modes. I leave mine at 50% meaning it will start working only when the humidity is above 50%. You can try defoliate to lower humidity or adding buckets with charcoal and cat litter to absorb humidity.

Humidity in the 70's all year, 60 inside tent. Dwc 50ltr bucket. Temp 18-40°c winter/summer.

It depends a lot of factors: climate zone, daily weather, grow space conditions, temperature, etc... You can buy a cheap hygrometer for your grow space and write down how much water you feed them in relation to the humidty and start to make your own conclusions. Google VPD charts, you'll have an amazing amount of information to help you with this.