Lowes has the plastic fittings. And getting the line into the body of the flow through the reactor as Rex mentioned (ie. not just injecting it on the side) is better. I have also seen people using an airstone to breakdown the bubbles more, but I don't see the advantage of that overtime since the airstone is bound to gum up. Shortening the reactor is possible. Testing it out is the only real way to know though.
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