I'm still toying on between CM3-4PM1 and CM3-3PT.

From my survey, both comes with the same pump and motor, only difference is additional pressure tank, right?

And I understand that the pressure tank will help to stabilise the water pressure a bit and reduce the pump start/stop, thus might be good for the pump's lifespan.

But the pressure tank requires maintenance, and from here some is saying that ppl will charge RM300 just for this. Else some said it's easy to DIY, just need to pump in the pressure using a bicycle pump.

So my question is:

1) Is the pressure tank really helpful to the pump? Or it's just marginal and can omit it for the maintenance free operation?

2) If the pressure tank is really beneficial, I have no problem to just pump in the air once a year by climbing up to the water tank area. But other than pumping air, any other maintenance required by the pressure tank?

Thanks in advance for your answers / comments.

Thanks for the info. Will look into this