As others have said, the beauty of coco is it's versatility. Some treat it like soil and water it every other day, letting it dry out a little and have good results.
But I do believe the best results with coco are when you keep the coco consistently moist, and never let it dry out. This is most easily done with an automated drip system running multiple times per day.
The plants will be the most happiest when the coco is always saturated. Salt buildup occurs when the coco dries out, so if you are able to achieve consistent moisture, run-off is not necessary.