Are these worth the bother or cost was thinking of installing one to run ice water through a second plate cooler to have milk entering tank about 4 degrees however ice after morning milking has to be rebuilt during day so only one milking would benefit from off peak i also was advised ice bank tanks are less efficent there certainly not insulated like a dx so with all the cost and bother is it worth haveing an ice builder or just let the tank cool after one plate cooler thanks