I am very glad I had an irrigation filter installed. For me, opening the heads wide individually would definitely not clear them, they had to be removed and cleaned one by one, bending over out in The Blast Furnace. Then when one puts them back in, one has to realign them. The entire process was time consuming, and would have been better spent pulling weeds or something.
So much nice just to flush out the main filter, or unscrew it and scrub off the mixture of sand and green scum, and be done with it.
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