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Yes I do plan to chill with ice water during the summer months. Depends on the temp of my tap water. AlaskanAg, do you recirculate ice water when pumping?
Yup, I use hose water to knock it down to about 100 in the summer, and 5hen take the runoff and hook it up to a sprinkler so I water the lawn, plants, whatever.
Then I fill an insulated cooker with ice water. 7lbs for a 6 gallon batch, 14lbs for a 11 gallon batch, I usually leave a gallon behind as well with the hop slurry or what not. I hook my pump up and have a return hose that returns to the top of the cooler. I found out by having the return hose go to the bottom i was recirculating warmer water.
To make your smaller aquarium pump more efficient, place your cooler at the same level as your BK. Eliminating a lot of head height will allow you to push more.
Lastly, if you have a march/chugger pump, running for 15 mins during the end of the boil to sanitize your lines, then keep it running while cooling, this will decrease your cooling time dramatically. And if you have a lot of ice make sure you don't crash down to lagering temps.
If you don't have this, keep a sanitized SS spoon or paddle and manually swirl your wort around the chilling coil. This will also result is great cold break.