Water level in overflow boxes
If you have a dual or single overflow in the same box, incorporate an expanding joint into each of the stand-pipe. This will allow you to easily adjust the height of the water level in the box to evenly distributer the water to both pipes, maximize surface skimming and minimize waterfalling noise. These expanding joints can be located at Home Depot in the electrical grey PVC section and will allow an expansion range of about 6 inches.
A slightly cheaper but with less range of motion method: in most cases you will need to attach a male treaded adaptor on the bottom of your stand pipe to attach it to the bulkhead in your overflow. Adjust the stand-pipe by turning the male adaptor in or out of the bulkhead. This will only give you about 1/2" range but should be enough to adjust the height so that it evenly distributes the water to both stand pipes.
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