First, dumping muratic acid (hydrochloric) down your well will contaminate ground water if not totally eat your point.
Firing a .22 down the well will induce lead fragments leaching into your water. Both are old school and there are far better remedies.
~~~~~~~~~~~~~~~~~~~~~~~~~
I have a 23',1.5" driven well,3' coarse-screen stainless point. 3/4hp pump. Check valve is at the pump. The check valve input is from a T above the galvanized well casing. Above the T is 1' of PVC 1.5" with a 1.5" PVC ball valve. This makes priming and maintenance extremely easy. All the plumbing between the check valve, well and ball valve is PVC held in place with rubber collar slip over "unions" and hose clamps. Since this is in the suction side, they draw tight when the well is being pumped. I can remove the entire "T + valve" assembly in under two minutes if I need to.
This well is driven into an aquifer ahead of a spring. Water quality is outstanding however because it is a shallow well, the point requires cleaning every 5-7 years ( well has been in for 35 years). And because of this, see above... Why make a day job out of something that takes only a few minutes without pipe wrenches? In the 35 years I have used this well, I have replaced the point 3 maybe 4 times,. Probably when I didn't have to, and before I wised up. Point gets clogged so pull the whole thing and replace it, right?
My water isn't profoundly hard. Some iron... but calcium build up is this #1 issue, and it will completely plug a point regardless of how coarse the screen is.
It had been ten years. I noticed the pump running three/half minutes to recover with corresponding high electric bills. After the following cleaning, I am down to 55 seconds with a 50 gallon bladder tank, 35-50 psi on/off.
I went to the local grocery and bought 5 gallons of ordinary white vinegar. 5% acid (non toxic). $13.00 invested. If vinegar will clean a coffee maker, why won't it clean a well point? Guess what. IT DOES!
Phase one: I opened the well. Water was very slow escaping during "de prime" = Point plugged. I dumped two gallons down the well and let it sit (well open) for 8 hours. I then used a portable air compressor with well closed to "pulse" the vinegar back and forth through the point. Reprimed the well and flushed it. Now I am down to 2 minutes from 3.5 minutes.
Phase two: Open the well again the this time primed it with 2 gallons of vinegar and closed it. I let it sit over night 15 hours. Next morning open the well. WOW! I had an eruption and got a face full of vinegar! Gas had built up from the vinegar eating away at the calcium and I assume, because of the pressure, had forced it's way into the gravel cone around the point. So 35 years of calcium crud in the cone has also been cleared. Gave it another pulsed air purge and reprimed the well. This time, however, the well was taking water about as fast as I could prime it with a garden hose under pressure. So I know the point is open. Flush the system. Now I am at 1:15 minutes on recovery.
Phase three: Repeat phase two. This time I used a "drain king" with water under pressure to finish backflushing the well. A drain king is an expandable bladder used for purging clogged drains. Or you could use a cap with a female harden hose coupling. Reprime and flush system. Now I am at 55 seconds which is about a 70% improvement from where I started. I don't think any further improvement is likely. I am satisfied.
One other option I was going to attempt was to scrub the inside of the point. Which I am not sure is necessary now.
From Lowes, I bought a 1.5" ID stainless wire brush, normally used to clean copper drains to be sweat fitted. I removed the plastic handle and inserted the wire loop it into the open end of 1/2" cpvc tubing, held in place with a screw through the tube. For extensions, 5' CPVC sections with corresponding male/female threaded plastic couplings, each of which further secured with a sheet metal screws to remove any chance of them becoming unthreaded while down the well. The top section contains a female garden hose connection.
The idea being to push this brush down into the point , add water pressure and up and down to scrub the inside of the point, using pressure to bring crud up and out of the well at the same time. Might be an option if Vinegar doesn't do it for iron build up.
Sometime we over look the easy way of doing things? I can also tell you that Vinegar really clears the old sinuses, which also got purged during the pressurized eruption. If you prime with vinegar and cap the well, stand back and release the pressure slowly or else you will be wearing it!
Good luck!