You should contact Kayatank to resolve this.
Another option is to add a power resister in series to reduce the current going to your pump. Reducing the current will slow down the motor and you will have less water in your tank during the on time. Let me know if you are interested in giving it a try and I'll give you more information.
I don't use this method, I have a programmable circuit that allows me to control the speed and the on off time.
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