Sand Filter Glass Bulb/Sight Glass

by Doug Maluchnik
(Blairstown, NJ)

Question about sight glass on a swimming pool sand filter


I wanted to use the waste control on the filter as I was vaccuming my pool for the first time this season to remove the dirt on the bottom. I noticed that the glass bulb on the sand filter is leaking and never noticed this before. Looking at the bulb it is fine and where it screws in seems to be fine.

I also noticed that when the filter is in normal operation that the same glass bulb does not have water running through it like usual.

Has my valve gone bad?




Thanks for the question Doug

First, when you're vacuuming to waste keep an eye on the water level. You're creating a virtual siphon of pool water when you vacuum to waste so keep the water level between 1/3 - 1/2 up from the bottom of the skimmer.

This will cause the pump motor to not have enough water and will reduce your water flow (gallons per minute or GPM).

Be sure to snug up, but not over-tighten the screws on the sight glass. If it's still leaking you can take it off and it may have an O-ring or gasket that is easily replaced.

Check the skimmers baskets for debris and be sure the pump basket is cleaned and positioned properly. Also check the pump basket to make sure it's not cracked as this will allow debris into the pump's impeller.

To check the impeller, turn off the power to the pump motor and the breaker. Reach in and remove the basket and into the opening to feel if the impeller is clogged with debris.

If you can't feel it you may need to remove the motor from the pump and inspect the impeller. It should turn freely.

You can also install a water flow meter to measure the GPM to be sure you're getting the correct amount of water flow.

Normally a good rule of thumb for understanding your GPM is this:

Pool size divided by 10 divided by 60 equals flow rate.

So, a 25,000 gallon pool divided by 10 hours of filtration will equal 2,500. Take 2,500 and divide that by 60 minutes per hour and you'll get 42 gallons per minute.

Also be sure your filter is clean and backwashed properly. If you have a cartridge filter be sure to clean them or replace them with new filters.

This will give you a good start and if you're still having issues you may want to get professional pool tech to have a look. But at least you'll know what to look for.

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

All the best

Robert

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Air Bleeder Spewing water

I had spent two weeks constantly vacuuming, brushing and adding chemicals to the pool to make it clear, but the water was still hazy so much so I couldn't see to the bottom of the deep end and often the shallow end as well. I thought maybe there was air trapped in the filter.

So I read through the manual of my newer Tagelus 60 sand filter. I turned off the pump and slowly turned the air bleeder black screw type knob, air came out but no water, The manual said to do this until water trickled out.

I then turned the pump back on and water jetted out, I then quickly turned off the pump. I screwed the knob back in, turned the pump back on, and again water jetted out, this time through a small man made hole on the tube the knob screws into. I wiped the threads to ensure sand wasn't the problem. Why is there a hole on the air bleeder tube, and how can I fix it so the water stays in the filter?




Thanks for the question

Normally when water is leaking from the multiport valve (MPV) it can indicate a broken or nonexistent o-ring. You can check this and also be sure the MPV is seated correctly on the housing. Sometimes they can be screwed in not using a star pattern which can cause air to get into the system.

The o-ring on the bleeder valve is about as big around as your pinky. Check this as well as this can cause a leak.

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 "Sand Filters" 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 in Sight Glass

by Judy Sanford
(Nova Scotia)

When I backwash my pool, a small amount (app 1 teaspoon) of filter sand ends up in the sight glass. Is this normal or do I have a leakage problem inside my filter?




Thanks for the question Judy

This is a normal issue that many pool owners have. It shouldn't be a problem. Every now and then you'll get a little sand coming out of the filter when you backwash. Some sand can easily get into the sight glass.

Do you RINSE after backwashing? This might solve your issue. Do a quick 10 second RINSE.

You also need to be sure you have enough sand in the filter. This is done by measuring from the top of the sand to the top of the filter opening. This area is called the "freeboard". You filter manufacturer should have the specifications. It can range from 8 - 13".

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 feel your situation is complex and want immediate assistance (within 24 hrs) you can make a donation of $35 per hour 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.









Hope this helps and have a great Summer.

Robert

Click here to post comments

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White Material Being Put In Pool Through Return

We changed our sand and started chlorinating our pool.

The return is shooting out white cloudy material.

What can we do?




Thanks for the question

It is very normal for sand to go back through the returns after you change the sand. What you're seeing are the dust particles from the sand. New sand is very dirty and it will take some time for it to settle.

This may take a week or so until all of the dirt is gone. What you can do is simply keep vacuuming the dirt the best you can. I changed the sand in both YMCA filters and had to vacuum for about 2 weeks until the returning sand stopped.

After a week or so you'll want to remove the top of the filter and check the "freeboard". This is the measurement from the top of the sand to the top of the filter opening. This is important because as the sand get wet it settles down. You might need to top the sand off. Call or check with the filter manufacturer for details. It could be anywhere from 8 - 13".

Barring any broken lateral or sand in the standpipe, this should decrease as time goes on.

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.

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.









Hope this helps and have a great Summer.

Robert

Click here to post comments

Return to Swimming Pool Sand Filters.

Pool Sight Glass Low Water Level

by Monique

So we are new pool owners and really have no idea what we're doing yet. I did a backwash and a rise for the first time and the sight glass cleaned up wonderfully but the water in the sight glass went from being almost full to lower than half full. What should I do?




Thanks for the question Monique and congratulations for having a pool. I know it'll bring years of enjoyment. When the pump is off the water will settle a bit and find the path of least resistance. This is normal and the sight glass should fill up when the pump is running again. The sight glass is mainly used for backwashing and rinsing. You can see when the water runs clear during a backwash cycle. This is when you want to turn the pump motor off, do a rinse, then back to filter.

Hope this helps answering your question.

If you feel your situation is more complex than this, I do offer a service to first time pool owners. This is a phone consultation for a donation of your choice. 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 no products or pool chemicals and nothing to sell you so you know I'm not bias. You can also check out all of my videos on YouTube for even more information. The channel is Clean Pool and Spa.

Pool Consultation

Robert

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Crack In Tagelus Pool Filter

My pool filter is cracked at the bottom where the filter sits on the stand. Can this be fixed?




Thanks for the question

Some tanks can have a hairline crack and be fine but the best option would be to replace the filter. All pool filters are under tremendous pressure and that small crack can turn into a nightmare if it's filtering on you're not at home. Your best bet would be to get a new one.

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

Hope this helps and have a great Summer.

Robert

Click here to post comments

Return to Swimming Pool Sand Filters.

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