First, one needs to know how and do their own plumbing as such things become cost-prohibitive when involving others that expect to be paid.
The swimming pool sand is a good idea as also is the timed purge valve deal. and both should be employed as well as several other tricks.
I have a huge water supply in my well; I honestly don't think there is a fast enough pump to run it low, let alone dry; however, I also have a huge silt/sediment problem.
The well and casing were already here thirty years ago when we bought the place.
The rock stockpile behind me has an Artesian Well that runs like Kern River day and night.
What many fail to do when drilling a well is to go down another ten/twenty feet below where the stream is hit and not allow the pump to get anywhere close to the bottom.
Even at that, every couple years or so a manual sand-bucket will need be used to bail out all the silt and sludge that gathers in that extra depth as it will accumulate to the point of covering the pump and thus the muddy sediment-filled water gets pumped into the water lines.
There is a reason why they call them sand-buckets; their original reason is to bail out sand and sediment; however, both my grandparents and many others around here used them for years as their only means of getting water from the well into a bucket and then carried into the house.
My more enterprising grandfather had a big pulley hanging on a big tree limb that hung exactly over the well and the sand-bucket was on a rope through that pulley.
That big tree was a lot older than the well and makes me wonder how on earth they drilled the well exactly under the big limb.
The well-casing stood nearly three feet above the ground and a close-fitting kettle was always over it except when using the sand-bucket.
Okay, we have got ourselves a sand-bucket and bailed out all the sludge and sediment.
Now, divide the water lines such that you are only filtering such things as the washing machine and the kitchen sink and possibly the water heater; filter life will increase ten-fold or more.
I can get by a year between filter changes and could go longer if they didn't begin imparting a smell.
I use those standard inexpensive string-wound filters; I haven't found any of the more expensive filters to really be of any more benefit; they just cost lots more.
If you have a really bad silt/sediment problem, add a sediment trap ahead of everything else; what this amounts to is a "sump", such as a very large diameter pipe with a big drain in the bottom.
Incoming water is elbowed down to about half-way the height of the "sump" and out-going water exits off the top.
Most of the silt/sediment will gather in the bottom to be drained/flushed out as often as needed; this gets rid of it before it gets any further.
Periodically drain/rinse-out the water heater; else, sediment will get so deep in it as to cover the lower element.
A water heater behaves exactly the same as the sediment trap described above; in fact, a second water-heater employed first-in-line and the heating elements not powered makes an excellent sediment trap that would probably be cheaper/easier than fabricating one.
When I plan to swap filters, I fill a couple clean barrels with water for my horse before changing the filter, enough to do him for a week; then, after cleaning out the filter housing, with the new filter standing in the housing, a pour in about a cup or so of bleach.
With everything put back together, I strategically open faucets where I especially want the bleach to clean the lines, such as the kitchen sink, and allow the water to run for quite a while.
I also turn on a hot water faucet to allow the bleach to get into the hot water heater and do some good there.
Occasionally, also saving back some horse water, I dump a quart or so of bleach down the well.
As for drinking the water === DON'T --- good clean bottled water is way cheaper than trying to filter bad well water.
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