Anyone purchase b-ionic in the 4 gallon buckets? Does it come premixed? The gallon jugs are a pain to mix and I am wondering what the deal is with these? I use about 8 gallons (4 of each) per year. Buying by the bucket is essentially 8 gallons for the price of 6, but is it a hassle mixing/dispensing? I have several empty 1 gallon containers.