One of the problems DIY well drillers
occasionally have is low production - inadequate water flow. I hear from
readers who have successfully drilled their own wells and are initially happy to
get free water. Then, after a month or so, they are looking to improve
their wells. Wells will improve on their own to a large extent when
they are first pumped due to underground erosion that makes it easier for water
to flow to the well screens. Frequently though, even more improvement
would be most welcome.
I have heard from two home drillers who
have offered solutions they have used successfully. I thought it
would be useful to others to post them.
The gist of both techniques is to force
water down the well to try to clear out any blockage around the well
screen. The more force you can muster, the more effective it will
be. If you can pulse it, the technique will be even more
The first is from Gary
in Newport News, Virginia. He drilled a well using this technique and initially had
only 3 GPM production. Below is how he improved it to 7 GPM.
As information, his situation was a little unique in that at the time he
had a two inch well screen and pipe inside a three inch pipe. He
has since raised the 3 inch piece as it was causing a loss of suction.
I have pieced together parts of several of his emails.
This evening, I came up with two ways to possibly back flush water down
the well pipe in order to force the fine sand and other sediments away
from the well point screens. Please note the two, black rubber adapters
in the photo's below. The smaller, upper one is 1 1/2" X 2". The larger,
bottom one is 2" X 3".
Idea #1. Use only the upper adapter and just remove the lower one. With
both my well pipe and casing both being down into the thick muck and
directly interacting with one another this would flush water up and out
of the casing. Probably bringing material up with it. The problem with
this idea is that only the lightest material will make it all the way up
and out of the casing. The heavier sand will rise part way up the casing
and then sink back down when you turn the water off. I chose not to use
this idea as I did not want to flush more sand into the well casing
while forcing it away from the well screens. In another situation it may
Idea #2. Use both rubber adapters just like the photo below. The bottom
of the lower adapter is 3", and it fits perfectly inside 4" sch 40 PVC
pipe, ...just like in the photo. Just slide it into the pipe. When the
water is turned to the well pipe, it tries coming up and out of the
casing with a lot of pressure. Initially, this seal leaked a little
water, but eventually sealed perfectly to the inside wall of the 4"
pipe, ...and never blew out of the pipe. The more pressure that comes up
against the 3" cup side of the adapter, the tighter it seals to the pipe
wall. Just be sure that the hose clamp on the 2" side of the
adapter is tight, or the pressure probably will force this adapter
upward. Whats great about this idea is that the lower adapter prevents
upward water flow thru the casing. This allows you to back flush the
well point without putting more sand into the casing. All material that
would otherwise rise in the casing and be too heavy to make it out of
the top would just settle back down around the well point when you shut
the water off. With this lower adapter in place, basically all the back
flushing force is used to push sand and other materials
horizontally away from the well point.
This evening, I used idea #2 and back flushed for one hour. I'm
going to let the sediments settle over night, then tomorrow morning
prime the system and recheck flow rate. I'll let you know how this
flushing method worked. It should make an improvement over the 2 gpm
that I got this morning.
See the photo below to help with the explanation
As you know, last evening, I back flushed my well point by attaching
the 2 hose manifold (well head) to the well pipe and forcing all the
water that the two garden hoses could supply for one hour. The purpose
was to force sand and other sediments away from the well point screens
and clear an area around the well point of finer sediments. This was
done because my new pump & well pipe was primed for the first time two
days ago and produced 3 gpm.
After pumping water for 24 hrs, the rate dropped to
This morning, I got out early, primed the well pipe and began
pumping water at 8:00am. Apparently the new brass check valve is doing
it's job well because when I removed the prime plug, water came up out
of the port. A couple of minutes after the pump had a strong, steady
flow coming out, I checked the flow rate and got 7 gpm.
On this first test the water was so gray colored that you could only see
about 1-2" into it. I don't know if what colored the water would be
either gray clay, or silt. No sand could be felt or seen in this water.
Over the next 2 hrs, I checked flow rate 4 more times and it steadily
dropped to until the last test was at
After the first test all water came out clear.
The two hose manifold with two, 5/8" hoses is how I took my well from 2
GPM to 7 GPM the other day. Of course, no two wells are the same. I have
a 2" well pipe, 2" X 4' well point, and a 3/4 HP pump.
I also heard from John in Wichita, Kansas. He had an existing
well with a screen that had apparently become clogged. Using a
device that contiually sends pulses of water, he improved
his flow rate dramatically with this technique.
Your website is very well done and a service to the water well
My garden well had a poor recharge rate. It's 1.25" galv pipe,3'
stainless well point,20' depth,and 6' static water level..I devised a
technique to attempt to improve the well..I put a half gallon of
household bleach in the pipe and left over night..I attached a Oatley
clog buster ( for 1-2" drain for $10 at the hardware store) to my city
water hose and injected 6 gpm for 1 hour to back flush the well under
After the operation my well produced 215 gph with a 75' hose,half-horse
Utilitec pump and no pressure tank..Just right for a sprinkler..
One more tip from Paul in Smithtown, New York. This
for folks with galvanized or stainless well screens. Please don't
try this on a PVC well screen!!
50+ years ago my father had a shallow well driven in East Rockaway NY
where the water table is only 8 feet down. It was made from galvanized
pipe. The stainless wellpoint would regularly clog and he would clear it
be pouring muriatic acid down the well.