Multiport valves are called multi-ports because inside the valve, there are multiple ports that allow the water to move in multiple directions. Pool water always enters the valve thru the “PUMP” port, but depending on the handle position, the water enters the filter tank through the top bulkhead or bottom bulkhead..
Also question is, what is the recirculated for on a pool filter?
Reviewing Recirculation The recirculate setting on a swimming pool filter is actually used to bypass the filter mechanism. Recirculate allows the water to flow out of the pool and back into it again without running through the sand or diatomaceous earth in the filtration system.
Furthermore, how do you change a multiport valve on a pool filter? How To Replace a Pool Multiport Valve Spring
- Before starting, make sure you TURN OFF THE POOL PUMP.
- Next release the pressure in the filter tank by turning the drain cap at the bottom of the tank a half a turn counter-clockwise.
- Take the top of the multiport valve off, by unscrewing the six screws around the outside edge of the valve.
Beside above, how do you backwash a pool with a multiport valve?
- Shut off pump, roll out backwash hose, check waste line for any closed valves.
- Turn multiport valve handle to backwash, or slide a push pull valve.
- Turn on pump.
- Backwash until water runs clear, about 2-3 minutes.
- Shut off pump, turn valve back to filter, turn filter back on.
How do you bypass a pool filter?
Bypass your filter so algae doesn't flow back into your pool with vacuum to waste.
- Turn off the pump.
- Move the multiport valve to the waste setting.
- Turn the pump back on.
- Close all skimmer lines except for one.
- Close your main drain down to 50%
- Set up your vacuum the way you normally would for regular vacuuming.
Related Question Answers
When should I backwash my pool?
As a rule of thumb, you should backwash and rinse your filter about once a week. The optimal time is right after you vacuum the pool. However, if your pool has had a lot more use than normal, it may be necessary to backwash twice a week.How do you vacuum a pool to waste?
HOW TO VACUUM TO WASTE A POOL: - Fill the pool before beginning, and run the hose while vacuuming.
- Shut off pump and switch the multiport valve to the Drain to Waste Position.
- Vacuum as fast as possible, the water level can drop fast.
- Stop vacuuming when the skimmer begins to suck air, allow the pool to refill.
Should pool skimmers be on all the time?
Although it's generally recommended that all the pool water undergo filtration every 24 hours, the pump does not need to run all the time. A proactive, productive and energy-saving maintenance activity is to remove the debris floating on the pool surface with a hand-held skimmer.Where is the backwash valve on a pool filter?
Turn off the filter system. Connect the backwash hose to the filter's waste port. Turn the multiport valve to Backwash. If you have a push/pull valve, open the backwash gate.Should filter be on when shocking pool?
It's best to run the pool filter for 6-8 hour before shock treatment, and to schedule the shock when the sun has set. Performing pool shock treatment will lower the potency of chlorine, making you use either twice as much chemical, or render your shock treatment ineffective.Do you run filter while shocking pool?
Run the filtration systemWhile shocking your pool will help kill any germs any algae, it won't actually get rid of them; for that, you need your filter. So be sure to run your pool filter for at least 24 hours.Do you vacuum a pool on backwash or waste?
To begin vacuuming your pool:If you do have this option, it is highly recommended that whenever you have algae, you will need to vacuum to waste. This option allows you to vacuum the algae up and send it out through the backwash line, avoiding getting algae into your filter sand.Is it better to run a pool pump at night or day?
Running your pool pump during the day is good because that's when the sun is out. UV rays are eating up the chlorine, so it is good to have the pump running to counteract the sun's effects. A pro for night time would be that it's off-peak utility hours. It's cheaper to run the pool pump at night.Can I vacuum my pool on backwash?
Vacuuming pool with filter valve in "backwash" position.The pool will clean up nicely like this until the valve is turned back to the normal "filter" position. That's when all of the dirt and debris (that was just vacuumed out of the pool) blows back into the pool through the returns.Which type of pool filter is best?
Sand FiltersIf you're on a budget, and you want to spend minimal time on maintenance, a sand filter is the best choice for you. It's also optimal for large pools because it won't clog as easily as other filters.How long do you backwash a sand filter?
After the hose fills with water, backwash your sand filter for 2 – 3 minutes, or until water runs clear.Do I have to run my pool pump every day?
Swimming pool pumps should be run an average 8 hours a day to properly circulate and clean your water. The pump should push your entire pool in gallons in this 8 hour period of time. A pool timer will help you keep your pump running the proper amount of time.What happens if you don't backwash your pool?
You do a backwash out of a pool. If the filter is not backwashed dirt and ?? filtered builds up and if it dies not stop the water flow rhe dirt will be discharged back int ok the pool. A good way to tell when to backwash is watch for the pressure on the input side ti increase by a few psi.Can you backwash a pool too much?
Backwashing Your Pool Filter Too OftenPool water washes funk and gunk out of your filter media, then exits through your filters backwash valve drain port. Backwashing is an important part of basic pool care, but overdoing it is one of the more common pool maintenance mistakes.Can you shock a pool during the day?
What Is the Best Time of Day to Shock a Swimming Pool? Shock your pool late in the evening or at night, when the sun is down to make sure free chlorine will stay longer in your water. Ultraviolet (UV) rays from direct sunlight greatly reduces free chlorine levels, so shocking during the day will not be very effective.What is the difference between backwash and rinse?
Rinse runs water in the same direction that normal filtering does. Backwash runs it through the sand in the opposite direction. Rinse is to clear any dirt out of the clean side of the sand before you start sending it back to the pool.What do I do if my pool water is cloudy?
Starting with the pH, then the chlorine, and then other chemicals after that. If the water still appears cloudy after adjusting all the chemicals, you can try using either water clarifier to remove the debris through the filter or use pool flocculant and then vacuum to remove any particles.What does Rinse do in pool filter?
In a sand filter, the rinse cycle allows water to flow back down through the sand to flush out any remaining dirt and debris from the filter and piping. The rinse cycle also restratifies (deposits in layers) the sand, letting it resettle in the filter tank.What's the difference between filter and recirculate on a pool pump?
The recirculate setting on a swimming pool filter is actually used to bypass the filter mechanism. Recirculate allows the water to flow out of the pool and back into it again without running through the sand or diatomaceous earth in the filtration system. 
Christopher Davis 
