You may want to try installing a "wye" strainer to keep the algae from the heads, although if it is a heavy infestation, you would probably be cleaning it out daily. Is there a screen at the foot or check valve? If not, install one. You may also have to put a strainer, similiar to the ones used on trash pumps, over the screen on the check valve. If that doesn't work, you'll need to install a screen fence about 4' x 4' to keep the algae from getting to the pump intake. You may have to try a combination of all the things I mentioned to achieve your desired results. Good luck!
I use a BANJO filter, which is ABS plastic, threaded at both ends, and has a filter that keeps debris out. The filter can be changed very easily, and the screen size can be changed as well. I purchased mine from Agri-Supply in Garner, NC. They have many different sizes/types available.
I have a filter on the suction side, and a screen on the check valve in the water that screens some of the trash but want to install something that cleans better and is self cleaning if possible. this stream has heavy algea.
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