calculating run off and watering amounts (coco grow)

i have 15 3 gallon pots that get pretty much equal shares of water from a 55 gallon drum per my watering system. i water 3x during daylight using about 5 gallons total. can someone tell me the correct method for calculating run off amount (want to hit 10% range) and also share some insight on whether or not im under/over feeding. this is my first coco grow and thought the trichs amounts are easily the best ive produced the yield isnt really what i expected and not sure if its due to under watering. im in my final week and a half and want to add as much weight as possible so any insight would be great.

If you put 5 gallons you should get a minimum of 0.5 gallon run off. I would say you should get 10% run off of what you put in everyday. I have 4 plants in 3 gallons pots and water once a day, I give them each a 1/4 gallon per day and get 1/4 gallon run off total.

Honestly the way I see it is the more times you water a day the less run off you need. I know a person who kills it with 6 waterings per day and no run off.
I would honestly just check your runoff. If your ppm is within 0.3EC of what your putting in your fine. Make sure your runoff PH is good too. That will tell you alot.

Daggy said:

Honestly the way I see it is the more times you water a day the less run off you need

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↑ spot on