Hayward Sand Filter Will Not Backflush

by Robert
(Columbia Station, Ohio, USA)

I have encountered a problem with my (Hayward) Sand Filter. It will NOT Backflush when I move the valve to the Backflush position.


The pool will run and circulate but for some reason it will not go into backflush mode when the valve is moved into position. Nothing happens

I have had the in-ground pool 15 years and I last changed the sand at the beginning of the 2013 season... filter functioned properly all last year and when I opened the pool this year (2 weeks ago)
Is there something I can check for? Blockage?
Did the valve go bad? What would I need to replace if it is a dirt or debris issue?




Thanks for the question Robert

The sand is probably good. I'd check the freeboard. This is the measurement from the top of the sand to the top of the filter. Your owner's manual should have this information. If not you can contact Hayward and they'll know for your particular model.

It sounds like the spider gasket inside the multiport valve (MPV) could be bad. It can wear out, crack or tear. It's a very easy fix.

Take note of how the filter sits in the housing because you'll replace it exactly that way.

Place the handle between the notches to loosen the tension. Doesn't matter which notches.

Temove the screws and pull straight up to remove the MPV. Scrape off the old gasket, clean the tracks, and glue the new one in place. Loctite #401 glue is good. Several dabs at the end points and in the tracks. Lube the gasket with Magic Lube, not a petro product like Vaseline.

Replace the MPV back into the housing and screw back in place in a star pattern, just like lug nuts on a tire. Remember to turn the MPV in one direction, not back and forth.

Here's a link with a picture:

Water Coming Out Backwash Hose During Filtration

I hope this has answered your question to your satisfaction.

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Swimming Pool Filter Backwashing" category.

Check back to this post for updates or answers.

If you feel your situation is more complex and want immediate assistance (within 24 hrs) you can make a donation of your choice and I'll answer your questions by phone.

Have I helped you find a solution to your pool problems? Did this information help you? Please consider making a donation to help keep this site going. Thank you.









Have a great Summer.

Robert

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Swimming Pool Backwash Trouble

by Kim
(San Angelo, TX, USA)

I backwashed and water is clear but pressure is still at 20 and won't go down.

This is the third year for that sand filter. Will a filter cleaner do the job?




Thanks for your question Kim

What I have normally found with sand filters is when there's high pressure it's either a low sand level or "channeling". This is when there's so much dirt, debris, and oily matter in the sand that the water can't be filtered properly. The water will then go down the sides of the filter, following the path of least resistance, and be returned back to the pool as non-filtered water.

First turn the pump motor off and open the top of the filter. Check the sand level per the owner's manual, then check for channeling. The sand should be smooth all the way around the top. Feel the inside of the filter around the edges for pockets or holes in the sand which should be obvious.

If there are pockets and holes your best bet would be a filter cleaner. A good one that I've found useful is called "Filter Fresh". I use this at the YMCA pool and it works great.

The directions on some cleaners might tell you to pour the cleaner in the skimmer. Unfortunately you don't know how much actually gets into the filter.

A better way is to pour the solution directly into the filter and allow it to sit overnight.

The next day top-off the filter with water, put the top back on the filter, and begin in backwash mode. This will flush out the dirt, oil, and cleaner.

Turn off the pump, take the top off the filter, and check for channeling again. Repeat these steps if necessary.

Thanks for your question and let me know how this works for you.

If you need immediate assistance (within 24 hrs) or for emergency personal assistance, you can make a donation of $35 per hour and I'll answer your questions by phone.

If you've found this site helpful please consider making a donation. Thank you.









All the best

Robert

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Connected Sand Filter Backwards

by Jeff
(Hamilton, ON, canada)

While opening my above ground pool I accidentally hooked up the filter backwards. When I turned on the pump it started spewing the filter sand out of the skimmer.

I have vacuumed the sand back into the filter but after vacuuming I backwashed and rinsed and sand was coming out of the backwash hose during backwash and out of the jet when rinsing.

What can I do to correct this problem? Is it likely that I have damaged the filter or pump?




It's not likely that you've done any permanent damage to the system. Hopefully you caught it in time, within a few minutes.

When I had my route in Arizona, another pool guy called me up and wanted my help on installing a sand filter. When I got there he had already done about 99% of the work. We started the system up, heard a rumbling noise, and sand started to go back into the pool. We turned the system off and he noticed he had hooked it up backwards and shown me what he did wrong. And he'd been doing pools for 23 years. Even guys like that make mistakes.

The system didn't sustain any damage and we were able to hook it up correctly.

You will probably have sand going back through the returns until it settles down. This always happens with new sand as well. The returned sand will noticeably start to decrease.

If it persists, maybe after 7 - 10 days, and doesn't decrease, it will be time to check the laterals, stand pipe, and multiport valve. The laterals and/or standpipe may have been broken, or the MPV may have sand in or. Or perhaps the spider gasket is ripped or torn. Here are a couple of links about that:

Water Coming Out Backwash Hose? I Need Help

Water Coming Out Backwash Hose During Filtration

Take the top off the filter and be sure there's enough sand. Most people put the right amount in, at first, but don't take into account the sand returning back to the pool (which is normally just dust and smaller particles). You need to check what's called "freeboard". This is the measurement from the top of the sand to the top of the tank.

The sand will settle after it gets wet so there will be a wider gap. Most filters for above ground pools, I believe, have a freeboard of 8" but you'll want to check with your filter manufacturer for that.

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Sand Filters" category.

Check back to this post for updates or answers.

If you need immediate assistance (within 24 hrs) or for emergency personal assistance, you can make a donation of $35 per hour and I'll answer your questions by phone.

If you've found this site helpful please consider making a donation. Thank you.









Hope this helps and have a great Summer.

Robert

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Sand Filter Valve

by Danny
(Gautier, Ms.)

My Directional Valve will not work in the filter position but works just fine when I Backwash or Recirculate position.

What could be the problem?




Thanks for the question Danny

My advice would be to check the gaskets of your multi port valve. First would be the spider gasket. Sometimes it can become pinched or torn through constant use. Replace it if needed.

Next would be the gasket under the handle of the MVP. These can also go bad.

Here's a link to the spider gasket picture:

Water Coming Out Backwash Hose During Filtration

Be sure to turn the dial only one way, not back and forth. This will reduce the gaskets life span and cause issues down the road.

I hope this has answered your question to your satisfaction.

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Repairs" category.

Check back to this post for updates or answers.

If you feel your situation is more complex and want immediate assistance (within 24 hrs) you can make a donation of your choice and I'll answer your questions by phone.

Have I helped you find a solution to your pool problems? Did this information help you? Please consider making a donation to help keep this site going. Thank you.









Have a great Summer.

Robert

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Sand Coming Out During Backwashing

by Cathy

I changed the sand in my Hayword 200 sand filter & have noticed some sand during backwashing. Is this normal & does adding new sand cause more pressure to flow out of the returns into the pool until the sand settles in the filter ? The flow seems stronger but I also notice bubbles for about 30 sec when I turn it back to filter.




Thanks for the question Cathy

It's normal that you'll lose a little sand when you change the sand out. It's very dirty and this dirt will bypass the laterals and go back into the pool through the returns and during backwashing. It will eventually settle. However, there are a couple of things that can cause backwash sand. The first is a broken spider gasket. This is found in the Multiport Valve. Replace it if broken. The 2nd is a broken lateral. This can happen during the filling process. If the filter tank is not 1/2 - 2/3 full of water the sand goes directly into the laterals. This is a lot of weight on the laterals without any buffer.

Something else you'll want to check is the freeboard. This is the measurement from the top of the sand to the top of the filter. Check your owner's manual or Hayward for the exact specs for your filter. The sand will settle and the freeboard will increase. You may just need to top off the filter with a couple inches of sand.

If you feel your situation is more complex than this, I do phone consultations. It makes things go much faster and many people have found it extremely beneficial, saving them time and money in the long run. All your questions will be answered. I have nothing to sell you so you know I'm not bias.

Pool Consultation

Swimming Pool Care eBook

How To Clear Up A Green Pool eBook

Hope this helps and have a great Summer.

Robert

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