Sand Filter Multiport Valve Just Has Numbers But No Settings...

by Steve
(Murfreesboro, TN)

I just bought a house that has an above ground pool.

Last year I had a pool company take care of it, but this year I want to do this myself.

I think I have everything taken care of and the water is clearing, but I am not sure the correct position my filter should be set.

I only have the positions 1, 2, 3, and 4.

Nothing is labeled filter or backwash, just the numbers.

The filter is a Hayward Swimpro Missile System.

What position should the filter be set on for usual care?

Which position is the backwash position?

Thanks so much for this site!! This is the best pool site I've found on the internet!!

Thanks for the question and the compliment Steve

I'm from Virginia and have alot of friends in TN. From Johnson City and Bristol to Nashville and right around your area in Franklin.

There can be 4 - 6 settings on a multiport valve for sand filters. They normally are:







When a sand filter has 4 settings, these are normally:





The #1 setting is usually for FILTER, while the #3 setting will be opposite, which is BACKWASH. The #2 setting should be RINSE and #4 is WASTE.

Again, these are the normal settings, but you may want to check the owner's manual if you have it or call Hayward just to make sure.

Here's a link that I use from time to time:

It has the PDF manuals for a few different series of Swim Pro Missile Systems.

During the Summer you'll want to run your filter about 8 - 10 hours per day and make adjustments at night, then retest in the morning.

This is so the chlorine doesn't get eaten up during the day by the sun and heat. Keep your chlorine between 1.5 - 3.5ppm and the stabilizer (cyanuric acid/CYA) between 30 - 50ppm.

The FAS-DPD has a test for the CYA and is very accurate.

Get a Taylor FAS-DPD K-2006 pool test kit. It's the best and the one most pool professionals use.

Water Testing Kit

Pool Water Testing

Hope this helps and will point you in the right direction.

And I'm always ready to talk about pools.

Have a fun and safe swimming season.


Follow Up Comment

By: Steve
Date: May 30, 2011


I appreciate your quick response!

Unfortunately I do not have the owner's manual and the website you suggested no longer has the manual to my
filter system.

I should have mentioned this, but I have a cartridge system instead of a sand filter.

Again, thank you for your help.

The local pool company nearest my home is no longer taking customers. We have had several really bad storms in the area and they are backed up with repairs.

I am getting more comfortable trying to work on the pool, but I still have a fear of messing things up completely!



By: Robert
Date: May 30, 2011

That clears it a up a little more. A cartridge filter.

With a cartridge filter you're not really going to have valves for backwash, waste, etc...

The water comes in and goes out. It's normally called Influent and Effluent.

You might be referring to the valves that control the skimmers, sprayers, and the like. If that's the case, I'd need to look at them to see where they go.

Normally, the valves closest to the pump are the suction lines and the valves furthest away are the returns.

If they're all lined up in a row, it's hard to tell simply from a question.

Hopefully you can have a pool tech to take a look at it, or you could find someone else who has an above ground pool to walk you through it.

I would buy some extra cartridges. Change them out with the dirty ones once per month, or when the pressure gets 8 - 10Psi over the new cartridge pressure.

This way the filter won't be down for long. Clean the dirty ones and swap them out as you did before.

Here's my page on cartridge filters. It includes a video on how to clean them.

Swimming Pool Filter Cartridge

Good luck with the filter and hopefully you can swim all season long.


Follow Up Comment:

By: Steve
Date: May 31, 2011


Thanks again for your quick response and help. I think I have things under control.

Today I vacuumed again even though I could not see the bottom of the pool. I took the filter out and cleaned it really well.

As I was putting everything back together again, the hose taking the clean water back to the pool developed a tear and water shot everywhere!

I felt like I was being "punked" and cameras had to be somewhere.

However, after a trip to the pool store for a new hose, the water return has never been stronger and the suction in the pool is better than ever.

Already the pool looks better!

Thanks again!


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