I got in my 20 plate chiller and used it for a 5 gallon batch last night. I took my old mini wort chiller and placed it in a small cooler with ice water to act as a pre-chiller. The tube from garden hose to pre-chiller is 3/8" and 1/2" from it to the plate chiller. I have 1/2" from kettle to plate chiller and then 1/2" running out into the yard. I opened the valve about half way and let it go. It wasn't a full on stream, but it wasn't a trickle either and the wort ended up in the fermenter at like 95-100 degrees with no real way to cool it more. I don't use a pump, only gravity. Do you think that having the wort at a trickle will have it get cold enough or do I need to look at some other system?