im using 6 ltr air pots mate , i fill them with a 70/30 mix coco/perlite , i dont seem to have any problems watering etc , i just feed 1ltr+ each day or every other day if there still abit damp , if you water slowely then you will be fine.
If you throw the water in it tends to pout out some of the side holes as it filters down through the coco too fast , ill feed a litres woth of nutes in a jug taking about 30 - 40 seconds and i spread it all over the top area so it filters through the coco evenly , still get the odd bit come out the side holes but its rare and very little , hope this helps Gaz