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Get a strainer installed in the supply - keep the crud out of the system
A filter after the pump is all that's necessary. Some like this....click here
Pulling off an end head of each zone would work.
If you do add a filter, I would recommend installing a Pressure Relief Valve on the pump. It should have one either way.
The output side of the pump should go like this....Pump...Spigot....Pressure Relief Valve....Filter....Ball Valve.....System
I like having the filter before the ball valve so I can close the valve, clean the filter, and not have all the water drain out of the mainline.
The size of the filter is generally dictated by the size of mainline. I.E., a 2" mainline would use a 2" filter. However, depending on the amt. of silt coming from your well, a larger filter would buy more time between cleanings. A few of our installed shallow well systems include a "Filter Manifold" comprised of 3- 1 1/2" filters, due to the amt. of silt the well produces.
Micron size is determined by the size of particles coming out of the well. On average, a 100 mesh screen is most suited to eliminate the size particles that cause problems for sprinkler valves and heads.
If you are serious about installing this filter, please take the time to install a Relief Valve. Cheap insurance against a burnt out pump. Especially with Miami Heat!
This post has been edited 1 times, last edit by "Central Irrigation" (Apr 29th 2012, 8:45pm)