Great, thank you! I don't have mine set up yet. About a month to go. Will keep all this in mind.You can use a dosing schedule with the simple doser. Just make sure that you have the dose amount set so that the pump runs at least 2.5 seconds on each dose. You would go through the calibration and then tell the Hydros how much was dosed and then it can calculate how long to run the pump to achieve the dose amount. The Hydros calibration is a little different since it just turns on the pump for one minute and then you tell it how much was dosed by measuring it. So if you repeat the calibration it will still only run for one minute. If you want to check the calibration then you would do a manual dose in the amount you want and then measure that. Even the smart dosers calibrate the same way. With the smart dosers you have to use a schedule unless it is one of the ones you can set to continuous use. The simple doser can be used in the ATO or AWC pump outputs if you want. Smart dosers can be used for AWC and ATO but require a different setup to do it.