Quote Originally Posted by mas985 View Post
Usually, low speed will be about 1/4 the pressure of high speed. So I would expect it to be about 3 PSI on low which may be too low for the guage to read depending on the guage. Filter guages start to lose accuracy after some time and especially if they have to weather the winter.


Thanks for that... like I said, this is a brand new system, and the gauge works when it's on high, so I suspect that it's just a matter of the gauge not being able to read reliably at such a low pressure.


Given that fact, any advice about how I should handle backwashing (in terms of knowing when to do it)... should I just follow a schedule, or should I stick to the normal logic of waiting for pressure to rise, even if it means not backwashing all season?