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Q: Should main drain be closed or open when pool is running?
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How do you run the pool filter through the main drain?

You run the pool filter through the main drain by moving your valve next to your pool pump to main drain only. This is usually a Jandy Value or the like. Usually there are three positions on this value. One for both main drain and skimmers. One for skimmers only and one for main drain only. As a precautionary warning. Only adjust this value with the Pump OFF. Doing it while the pump is running may cause significant damage to the value. No one needs additional pool repairs if it can be avoided. Hope this helps. : ) The above answer is only good if there is a dedicated main drain line to the pump. Most pools in California have the main drain line connected to the front port of the skimmer and use a diverter valve in the bottom to regulate the ratio of bottom or skimmer suction. Jandy and Ortega valves are both designed to be adjusted with the pump running with no fear of damage. Multiport valves should only be adjusted with the pump off.


When you do laundry why does the floor drain start to come up with water from the washer?

The drain from the washer to the main line is getting plugged and the floor drain is easier. Drain cleaner in the floor drain should take care of it.


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When your pump is on it sends water out the drain in your back yardno matter if you have the main drain valve closed or open How do you fix this problem?

Is this a sand filter? How many valves control the flow of water? It appears the b/w valve is defective.


Should all swimming pools be built with two drains for safety?

The main drain should be split to two drain basins at least three ft. apart. This is done to prevent suction entrapment.


How can you tell if you have a trap in a drain line?

If you have a floor drain, there is a trap on the bottom of that. The main line shouldn't have a trap in it. There does not need to be one on the main because each fixture should have one and that's just another place for a clog to form.


Where should drain valves be fitted in a cold water supply system?

The key word is "drain", meaning it works by gravity, so a drain value should be at the lowest point in the system. Typically there is one just past the meter. If a lawn irrigation system is a branch of the main system it should have its' own drain valve for winterizing it. You can purchase stop valves (or shutoff valves) with built-in drain or bleeder valves.


Does the main drain line in skimmer have water in it when closing the pool?

No. You cannot use the main drain to lower the water level below the skimmer. This is because the main drain is not really a drain. It only connects right back to the 3 port valve in the skimmer.


Why is the lawn sprinkler head leaks water when the main water valve is shut off?

After a main water valve is closed the system's PVC pipes are still full of water and will drain to the lowest sprinkler head until the system is empty.


Do you need to lower your Main drain pipe behind the wall to install under mount kitchen sink?

That would depend on the height of the drain and how deep the sink is. As long as the drain is lower than the bottom of the sink, it should be fine.