Foo022

New member
Jul 5, 2022
4
Connecticut
First of all, a thanks to this forum - I bought a home with a pool having never owned one before last season, and what I inherited was a 30 year old pool that had become an abandoned swamp. Winterized but uncovered for at least one year, possibly several. I had to learn how to recover the pool, repair the equipment, then manage the chemistry and finally winterize and re-open this spring. The knowledge gained here and the poolmath app have surely saved me thousands of dollars and hundreds of hours, and given my family and I the opportunity to enjoy the pool time.

This year I've been faced with a problem I didn't experience last year, the floor of the pool is turning absolutely filthy. At first I thought it might be tree pollen, but now I think it's runoff from rainwater as last year we had drought-like levels of rain and this year it's been a neverending parade of thunderstorms with brief but torrential downpours. I should probably go out and observe the next chance I get when it's pouring to see where the surface water is running and what I can do to stop it.

But that aside, I haven't been able to get the pool clean again for the past 3 weeks. The dirt settles on the bottom mostly, some on the walls, and leaves everything brown. I have a sand filter, filled with fresh sand and new laterals this season as I had no idea the state of the old stuff, and a mid-wall located vacuum port. I'm using a 1.5" hose and a manual vac. It takes hours to vacuum the whole pool slowly and carefully trying not to stir the dirt up and I have very little free time to work on it with 5 children to take care of, leaving me basically just the weekends to do anything.

-3 weeks ago I tried to hit the worst spots before family went swimming and hopelessly stirred it up, water was cloudy but nothing terrible.
-Last weekend I vacuumed about 1/2 of the pool, starting at the shallow end, which left the floor looking perfect at first but by the time I reached the deep end the water was so cloudy I couldn't see the bottom there. I got discouraged and gave up for the day.
-A few days later the entire floor of the pool was brown again but the water clear - seems like the dirt settled, but also we had like 2 more heavy rains this past week
-Today I vacuumed the entire pool, took about 6 hours with several breaks to deal with children and other things. Water again is cloudy enough I can't see the deep end bottom at all, and some of the vacuuming was just blindly pushing the vac head into the abyss and trying to hold a straight line.

I don't think I'm just stirring stuff up, I'm moving very slowly and deliberately. I think what's going on is some part of the dirt is too small for my sand filter, and so it just sprays back into the pool after I vacuum and turns the water cloudy, then eventually settles on the bottom if I leave it a few days. If this is true then I'm never going to get it out. Here's my ideas for possible solutions:

1. Add DE to sand filter, to hopefully catch the stuff the sand can't. I've never tried this, but I'm not too concerned about back-washing the DE given where my waste drains. Unsure of the price of DE.
2. Add floc and vac to waste. This worked well for me when I was first reclaiming the pool swamp, but will lose me a TON of water since it takes hours to vac the whole pool. I'm worried more rain storms will bring my problem back before I can even get the water level and chemistry back to normal.
3. Buy a fancy expensive vacuum robot that has it's own filters, assuming they can filter smaller than the ~30 micron or whatever my sand filter is. I'm appalled by the price of some of these things on Amazon, but maybe it's an investment that's worth it for the long run?

Looking for thoughts and advice on what I should do, maybe ideas I haven't thought of or perspective on the ideas I've come up with. Thanks in advance!
 
Welcome to TFP! :wave: Before we get too far ahead of ourselves, let's start with the basics. Can you post a full set of test results with TF-series test kit or Taylor K-2006C? We have to start there. Also need sure to update your signature with all of your pool and equipment info. It helps tremendously. See mine as an example. Well be glad to help.
 
My pool's volume is approximate as I couldn't find any paperwork from the previous owner. 30k gals seems to work well for chemical additions using the poolmath app, maybe a bit on the conservative side. It's about 20x40 rounded oval with weird geometry on the deep side that makes the math too hard for me to calculate, deep enough for a diving board (bolts too rusty safely install it). Here's some years old pictures from bing maps birds eye view that shows it pretty well, if anyone can figure out how to better calculate it that'd be great lol.

You can also see the roof whose gutter is likely a significant contributor to the rainwater runoff.

Screenshot 2023-08-19 213905.pngScreenshot 2023-08-19 214248.png


I don't test for TA/CH/CYA frequently but I'll post my most recent:

FC 4.0 (today before adding chlorine)
CC 0.1-0.2 (today)
pH 7.9 (today before adding dry acid)
CYA 45 (11 days ago)
TA 66 (20 days ago)
CH 120 (20 days ago)
Temp 74 (today)
CSI Calculated -0.32 (today)
 
Good feedback. Nothing crazy odd about the test numbers except you may want to check the TA math. It should be in increments of 10.

Based on what you have been finding in the pool, I would start with an Overnight Chlorine Loss Test. Best to rule out excessive organics right away.
 
The 66 TA comes from multiplying the measured result by the CYA adjustment factor, as explained in the manual that came with my test kit. It says to use measured TA - (0.33xCYA), with the 0.33 varying slightly for higher/lower pH. Am I doing something wrong? My pH seems to consistently creep up, and I find I'm adding a small amount of dry acid frequently to keep it in check.

I have been targeting a FC level of 6, in the middle of the 4-8 recommended range by the poolmath app. However I frequently go 2, occasionally 3 days between test and adds and have measured levels as low as 1.8 or 2 at times this year. CC always measures 0.2, or to be more specific one drop of the reagent to change from pink to clear in my 25ml test sample, other than a single reading of 0.4 once this season. I did have one green algae bloom at the start of the season when I first opened the pool, I let it go a week without chlorine while I was still getting it filled and didn't have the pump running yet - a lesson learned there. Cleared up with a SLAM.
But it sounds like letting it dip down to ~2 is dangerous, so I will change my target to 8 rather than 6 and try to avoid those 3 days between measurements. It can be tough with 5 kids and a job to get out there every day to test and add.

I am pretty confident my current problem is dirt not organics, but I'll trust the process and try an OCLT tomorrow. It's already 10:30 here and it gets light at 6.
 
I'm wondering why you have to vacuum SO slowly.
Even with deep silt (about 1/2 inch) the vacuum should cut a clear path through it without clouding water. That being said, it looks like you have a vinyl pool, so your vac head has brushes? That may be a factor.
I'm leaning toward an issue with your pump's flow rate. If you are vacuuming to waste, you should be getting strong suction, as the water it basically being sent down an open pipe, low restriction to flow.
Also wondering why the dirt is not being picked up by skimmers while still on surface. Make sure skimmer(s) have their weir gate installed and pivot freely throughout its range of motion.. These are very important in allowing debris to be drawn into the skimmer.
What is pump RPM set at during vacuuming?
 
Just post the TA result from your test kit. No need to adjust for CYA.
Use PoolMath as it will make any necessary calculations/adjustments for you.
Digging through some previous threads on these forums to confirm, I see that I have been doing this wrong. I updated the log entry in my app to reflect the correct value of 80 for TA. Thank you.

I'm wondering why you have to vacuum SO slowly.
Even with deep silt (about 1/2 inch) the vacuum should cut a clear path through it without clouding water. That being said, it looks like you have a vinyl pool, so your vac head has brushes? That may be a factor.
I'm leaning toward an issue with your pump's flow rate. If you are vacuuming to waste, you should be getting strong suction, as the water it basically being sent down an open pipe, low restriction to flow.
Also wondering why the dirt is not being picked up by skimmers while still on surface. Make sure skimmer(s) have their weir gate installed and pivot freely throughout its range of motion.. These are very important in allowing debris to be drawn into the skimmer.
What is pump RPM set at during vacuuming?
I think I was just being overly cautious. When I move the vac head too quickly the "stuff" on the bottom of the pool got stirred up, and after a previous attempt to vacuum the whole pool ended up with the deep end invisibly clouded by the time I got to it, I wanted to make sure I avoided that. My pump is a single speed 1HP. I don't know if it's underpowered for the size of the pool, or if the mid-wall vac port with the safety fitting that forces me down to a 1.5" hose (main plumbing is 2") is limiting my suction. Weir gates work okay, although one gets stuck shut every time I turn the pump off forcing me to keep it running 24/7 or else suck air when it restarts. In this case I've been vacuuming to filter not waste. The reason it's not getting picked up is that it isn't dirt.

Best to rule out excessive organics right away.

I'm convinced your problem is non other then plain old algae.

Sounds like a classic case of algae.
You were right, I was wrong, it's algae. I went out today for a closer inspection, and found significant deposits of the "dirt" on my shiny metal pool ladder which I didn't vacuum or brush yesterday. No rain to account for that. I swiped some off with a paper towel, and can tell just from looking closely that it's algae:
20230820_121024.jpg20230820_121029.jpg

Now my concern is, is this yellow/mustard algae as I suspect? Prior to vacuuming I thought the pool looked brownish, enough that I thought it was dirt. Also FC levels have been mostly kept in check and CC levels have not been high, which again points to yellow algae I think as it can survive normal chlorine levels.

Thanks for the help, I've learned several new and important things from this thread, despite my frustration level with owning a pool being at an all time high right now.
 

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FC levels have been mostly kept in check
"Mostly" doesn't really count. Either they were or were not. Sounds like they were not at least once.

Time to start a SLAM Process.

Maybe a hard lesson - but a great learning experience.
Hopefully - after your SLAM is complete - this will help keep your frustration level to a minimum.
 
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First of all, a thanks to this forum - I bought a home with a pool having never owned one before last season, and what I inherited was a 30 year old pool that had become an abandoned swamp. Winterized but uncovered for at least one year, possibly several. I had to learn how to recover the pool, repair the equipment, then manage the chemistry and finally winterize and re-open this spring. The knowledge gained here and the poolmath app have surely saved me thousands of dollars and hundreds of hours, and given my family and I the opportunity to enjoy the pool time.

This year I've been faced with a problem I didn't experience last year, the floor of the pool is turning absolutely filthy. At first I thought it might be tree pollen, but now I think it's runoff from rainwater as last year we had drought-like levels of rain and this year it's been a neverending parade of thunderstorms with brief but torrential downpours. I should probably go out and observe the next chance I get when it's pouring to see where the surface water is running and what I can do to stop it.

But that aside, I haven't been able to get the pool clean again for the past 3 weeks. The dirt settles on the bottom mostly, some on the walls, and leaves everything brown. I have a sand filter, filled with fresh sand and new laterals this season as I had no idea the state of the old stuff, and a mid-wall located vacuum port. I'm using a 1.5" hose and a manual vac. It takes hours to vacuum the whole pool slowly and carefully trying not to stir the dirt up and I have very little free time to work on it with 5 children to take care of, leaving me basically just the weekends to do anything.

-3 weeks ago I tried to hit the worst spots before family went swimming and hopelessly stirred it up, water was cloudy but nothing terrible.
-Last weekend I vacuumed about 1/2 of the pool, starting at the shallow end, which left the floor looking perfect at first but by the time I reached the deep end the water was so cloudy I couldn't see the bottom there. I got discouraged and gave up for the day.
-A few days later the entire floor of the pool was brown again but the water clear - seems like the dirt settled, but also we had like 2 more heavy rains this past week
-Today I vacuumed the entire pool, took about 6 hours with several breaks to deal with children and other things. Water again is cloudy enough I can't see the deep end bottom at all, and some of the vacuuming was just blindly pushing the vac head into the abyss and trying to hold a straight line.

I don't think I'm just stirring stuff up, I'm moving very slowly and deliberately. I think what's going on is some part of the dirt is too small for my sand filter, and so it just sprays back into the pool after I vacuum and turns the water cloudy, then eventually settles on the bottom if I leave it a few days. If this is true then I'm never going to get it out. Here's my ideas for possible solutions:

1. Add DE to sand filter, to hopefully catch the stuff the sand can't. I've never tried this, but I'm not too concerned about back-washing the DE given where my waste drains. Unsure of the price of DE.
2. Add floc and vac to waste. This worked well for me when I was first reclaiming the pool swamp, but will lose me a TON of water since it takes hours to vac the whole pool. I'm worried more rain storms will bring my problem back before I can even get the water level and chemistry back to normal.
3. Buy a fancy expensive vacuum robot that has it's own filters, assuming they can filter smaller than the ~30 micron or whatever my sand filter is. I'm appalled by the price of some of these things on Amazon, but maybe it's an investment that's worth it for the long run?

Looking for thoughts and advice on what I should do, maybe ideas I haven't thought of or perspective on the ideas I've come up with. Thanks in advance!
If you are concerned about DE, use cellulose fiber, completely inert and biodegradable. A couple of handfuls is all that is needed.
 
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