I’m curious about why you want to feed or even water the plants so often? Plants can only absorb so much nutrition. When you are watering and feeding so often you are literally just pouring money down the drain. You also don’t need to replace carbon filters that often. I’ve used the same filters for 2 years or longer. You’ll get some smell when you open the tent in flower, but it will get filtered out once the tent is closed back up.
So, as this is my first Coco grow, I'm experimenting a bit. I've found that this plant responds well to a light watering twice better than one big watering.. I have been watering to around 20% runoff but have found its better to take that same amount of water to split into two waterings, one at lights on and one 10 hours later. The second watering gives runoff. This is not my idea, I've seen this recommended on Coco forums so I'm just following advice and the plants seem to like it. I also water normally, without splitting the watering into two, and this works well too.
I'm not waisting nutrients, I'm just keeping the plant at the correct PH and EC levels. I'm also making sure to watch for salt buildup and PH problems. Side note, when your only growing one plant at a time, a bottle of Nutrients will last a LONG time... This is not an issue for me. (ever use a 1/64 tsp to feed your plants? I do !)
What I'm noticing about coco is that it drains very well and does not get "bogged down" into a swamp like soil does. I cant water very heavily without an issue, the plants seem to love it and dry out quickly. This allows me to water more often (and feed more often
as needed)..
I do need to replace my carbon filters every gro, they barely get me through flower and start to give an odor at flower end (slight), so I keep two filters on hand at all times and use a new one every grow. Thats just been my experience with odor, something I'm working on now. I'm giving this plant away tomorrow, its a smelly one. Side note, I'm using junk (cheap) carbon filters-- you get what you pay for I guess. I just cant get myself to pay $150 for one of the high end filters.