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Hey there @Blue_dreamer - going Hydro is great fun, having tried a few types I have settled on coco and pebbles, with the main reason being the time I can spend away from home.How long will the water take, when the plants are mostly grown, to evaporate? I'm kind of looking for something that can support my plants while I'm gone for 2 weeks on vacation this summer.
With a DWC or similar you really must change the reservoir very regularly, meaning you can't leave for more than a few days at a time.
If the plan is to go Hydro to be in a position to galavant at will, any simple recirculating system with an additional res attached to a stop cock will work just fine.
An example, 4 plants in full flower in the recirculating system will get through between 10 and 15 litres per day - so when I am away for 2 weeks, I attach a 225 litre water butt to the res, and as the res empties it gets fed - but it is essential to keep the water aggravated