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Sprinkler modification needed for creek pumping

Sprinkler screen close up modification how to instructions


The pump in our creek sucks up tiny particles that eventually clog up the stainless steel filter on our reciprocating lawn sprinklers.

We started experimenting with deleting the filters last year. The initial concern was that the sprinkler head might get gunked up and stop working. That hasn't happened yet, even with the junkier plastic version.

I have a feeling this modification wouldn't work on a system with lower pressure, but it might be worth a try. The replacement cost for these things is less than 10 dollars, but the feeling of security one gets knowing you can water the garden during a dry spell is priceless.



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Generally speaking, I have found over years of dealing with equipment that require good maintenance and working with contaminated sources for that equipment, that these strainers are only needed for close tolerance moving equipment like piston pumps and spool valves that can jam easily. The impulse sprinklers you have in the pictures do not have any internal moving parts that will jam and that only leaves the exit nozzle. If it shows any reduced flow it can be easily fixed with a pin, or torch tip cleaner, or a sharp scratch awl, as the nozzle hole is generally quite large and some are adjustable. As for the strainer themselves, if you really want or think you need them, mostly they can be cleaned by dropping them in vinegar to remove the carbonate (sodium or calcium, depending on the type of rock in your stream) that clogs them from the water source.
Comment by vester Wed May 11 21:40:51 2011
I'm glad to hear that you agree the sprinklers won't be harmed by gunk. In our case, what tends to build up on the screens is films of algae that wash out of the hoses --- the yellow hoses, especially, seem prone to growing algae inside between uses. One mat of algae is all it takes to completely shut the sprinkler off! Since I started taking the screens out in the middle of last summer, I've been much happier.
Comment by anna Thu May 12 08:00:18 2011

Next time you need to buy a hose, look for hose resistant to alae and other microbial growth. They don't cost more than others and do tend to last longer than plane old hoses. I have had some hoses like this in use for several years now, left pressurized all the time and have had no problems with plugging manual nozzles with any sort of debris, living or inert. I do remember having this problem years ago but not since using hosing more resitant to this problem. These hoses also tend to last longer when left pressurized continuously as I leave them.

I also pick nits about over torquing water hose fittings which causes premature failure of the hose washers. If it has to be more than hand tight then the washer needs replaced. If it is new and is more than hand tight it is likely to leak soon and making it too tight will often damage the hose male and/or female fitting threads.

The next nit I pick is the one about people forcing the male hose fitting onto 3/4" pipe threads. 3/4" pipe thread is a nominal size having nothing to do with it's actual dimensions, with 14 threads per inch and the thread is tapered. While water hose fittings are straight thread with 12 threads per inch. As the water hose fittings are normally brass or plastic, they can be forced onto pie thread but in the process are ruined and when divorced from each other the hose fitting is generally useless. The problem is preventable with inexpensive adapters available at most hardware stores and any catalog like Grainger's.

Well the nits are picked and I hope the comments prevent someone having trouble with water hoses.

Comment by vester Thu May 12 15:20:14 2011

That's excellent information! I didn't realize that they made algae-resistant hoses. I'll have to look into that when our current hoses finally die.

Luckily, your second point isn't relevant to us --- we always hand tighten. But your third point makes me wonder if we got the right fittings to go from the PVC pipes to the hoses. I'll have to check on that.

Comment by anna Thu May 12 18:38:00 2011

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