That particular Pentair check will restrict your flow a LOT. That *might* not be bad, since on AG pools, the pumps are often oversized and the filters undersized. But it also could essentially turn your flow off!
I'd recommend this one, instead:
Jandy 7305 2-Inch to 2-1/2-Inch Check Valve
And, it's not necessary to put it right next to the feeder -- you can put it next to the filter instead.
One more tip: if you use a pump timer, it's a bad idea to have the pump run only 1x per day. It's much better to run 2 x 3hrs, than to run 1 x 6hrs. There are several reasons for this, but in your case the most relevant one is that each pump cycle will flush out built up gases from the feeder.
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