After running a squid for the past 8 months i can no longer recommend them.Mine has failed.They are a great idea,but unless you run pre-filters on your return pumps,they inevitably clog up and fail.Not to mention the reduced flow from restriction.Mine failed last week so i replaced it with a T and used over-sized(1" plumbing) and reduced it to 3/4" at the pump and at the dual PVC elbow returns.The amount of flow i gained since the new plumbing has been incredible.By using over-sized plumbing you reduce the friction in the plumbing.Ever blow thru a coffee-stirrer then a 7-11 straw.same principle.
My overflow couldn't handle it so I had to modify it and add another U-tube.I would say I've gained over 200 GPH since the removal of the squid.