Inadequate circulation is often ignored in pool operation. Many pool owners and operators cannot obtain clear sparkling water, even though their filters are operating properly. This may be happening because all of the pool water is not passing through the filter, but a portion of the same water is going to the filter time after time. Some pools do not have a bottom main drain and some pool owners who have main drains, cut down or shut off the water flow through the bottom main drain. This means the water is entering the skimmer and only the surface water is being filtered, leaving the bottom water in the pool not filtered and many times without sufficient chlorine.
If your using a heater or solar cover, this problem is further magnified because warm water rises carrying chlorine to the surface, leaving the bottom water with poor filtration and disaffection.
Main drains should be open. If your pool does not have a main drain an automatic pool cleaner of any kind would do the same purpose, and will act as your main drain.
Return lines should have directional fittings (eyeballs). For maximum circulation, return “eyeballs” should be adjusted to direct the water at a 45 degree angle towards the bottom of the pool. All return water should flow in the same counter clockwise direction. This sets up a whirlpool effect to carry the chlorine to the bottom of the pool and debris to the main drain.
Often times overlooked is the weir (skimmer door) in the skimmer. All skimmers should have a properly working weir with the pool water level adjusted to allow 1/4 inch of water to flow over the weir. Without good filtration, circulation, and temperature control is will be difficult if not impossible, to achieve and maintain
QUALITY CLEAR POOL WATER.