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It could be blocked but on the appearance in the photo it's not.

Stick your garden hose in the bottom outlet and backflush it while taking note on whether the flow seems restricted.

If it seems to flow OK it likely is.
 

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Vinegar works well and it's what I use, much as THX describes.

I would also add the step of flushing it through with a bicarbonate of soda solution afterwards to neutralise the vinegar.

If you make a fitting to connect your garden hose securely and leak free to the bottom hose outlet it can be pressure flushed with the garden hose. Watch your pressure.
 
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