If a filter is placed upstream of your accumulator tank it will not restrict pressure of the delivered water to the house until after the water has run for a while like a long shower or filling a Jacuzzi tub or other uses which would require protracted pump run times.. Filling a cooking pot, washing hands, and other low volume uses will all enjoy good pressure and flow rates. A larger (or additional accumulator tank in parallel with the first) will give longer water use times at high pressure and high flows before too much loss of pressure is noticed.

If you have a low flow (energy conservation type) shower nozzle then even long showers might not give low pressures. Might consider more pumping power in the well pump. I should think 3/4 or 1 HP should be sufficient.

Note to GaryM: Think of filters as resistors and accumulator tanks as capacitors.

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