Personally, I like to have a valve as close to the pump as possible and then a disconnect between it and the pump. this leaves you less water in the pipes to deal with when you remove it. the way you have it now from what I can tell, you will have to remove everything from under you r stand to get that pump out. for mine, I have the disconnects right at the pump. dont rely on that check valve to stop all the water. they can and will fail. just make sure that if it does fail, you have enough drawdown space in your sump. I am guessing the ball valves are for the various reactors and skimmer? you may want to use gate valves. although more expensive, they are much easier to fine tune and turn if you are on your knees reaching all the way to the back of the stand to turn off a stuck valve...
also, I would just run one pipe up to the returns and then split it up there. saves you several elbows and another disconnect.
also, I would just run one pipe up to the returns and then split it up there. saves you several elbows and another disconnect.
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