I usually make my water in large batches. I always flush my RO membrane until the TDS reaches 0. Usually about 3-4 mins.
I have a 10 gallon ATO tank and a 25 or 30 gallon ish brute container for salt.
I've always thought about using an electronic shutoff valve at the inlet and use my apex with a float valve to turn on or off. That way the pressure through the RO membrane remains fairly constant.
This option would work for you or get a DI. I don't think I've changed my DI resin for at least 6 buckets of salt and a year's worth of ATO.
In the end you'll probably end up paying the same amount of money.
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