Yellowout and algae

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This is a new post for a current problem that PoolStored has helped me out quite a bit with.
I don't think I ever got a answer, if there is one, to what happened over the last week.
Day 1 - vacuumed significant algae from floor via filter\backwashed
Day 2 - vacuumed similar amount of algae from floor via filter\backwashed
Day 3 - scratching my head trying to figure out where in God's creation all this algae is coming from. my thoughts are that the filter is spitting it back out. called our pool servicer and found out we shooda vacuumed to waste... so we vacuumed to waste\backwashed, brushed the floor.
Day 4 - Crud! significant algae on the floor. Vacuumed to waste\backwashed. Brushed the floor
Day 5 - Holy cow! I need not say any more

Any thoughts on what was going on here?
1. Was my my pool pump regurgitating the algae from the incorrect procedure the first 2 days?

2. What do you think was going on during days 3 & 4 when I was sending that junk to the woods?

it's my understanding that if the substance is smaller than a piece of sand, it will pass through the laterals... ie; algae

Thanks for any help understanding what caused this to happen
 
Have you gotten the test kit that was recommended?

Have you done the SLAM Process?

Vacuuming and filtering will not kill the algae in the pool. The algae will just keep on multiplying.
 
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Of course...SLAM is the solution that I terribly overlooked. For some reason it was easy to think that if it "LOOKED GONE" it was gone I had forgotten that the spores lived on and quite frankly i should have known better. Thank you for the reminder.
 
Okay guys and gals. I thought I was done with my SLAM (no, I I didn't do the OCLT). I feel like I failed the process so please try to take it easy on me. Anyhow, I added enough chlorine to get the level up to 30 ppm (a little excessive but I had to estimate due to lack of a proper test kit), which was verified upon receipt of correct test kit. Please keep in mind during the next 3-4 days, the water looked perfectly clear, maintained a perfect balance and all algae that died and collected on the bottom of the pool was vacuumed to waste...a lot at first and practically nothing now. Yesterday, when I tested for chlorine, I had 4.6 ppm. When I checked for combined chlorine, there was no indication (no pink). This morning, my chlorine test result was 1 ppm, with a hint of CC, a difference of 3.6... I understand that the typical loss per day is around 1.5
I do understand that the sun is responsible for most of that 1.5... anything beyond that, I have to believe organic compounds such as algae are responsible for consuming additional chlorine.
Help me understand what might be going on.
 

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Pool water has been looking great after after a frustrating 2 weeks ridding pool of mustard algae. Yesterday, my combined chlorine number crept back up to .8
It had been floating around .2 - .4 over the last few days. I started the SLAM again yesterday (20ppm with beautiful water). I took a reading last night for my OCLT (19.5ppm). My reading this morning was 19.5ppm. In my mind the OCLT passed, but there was pink water when I did the CC portion of the test. it easily disappeared with 1 drop of 0871, but 1 drop=.5
My hope is that I'm misinterpreting the CC portion of the test and quite possibly there might be some false positives going on.
Am I doing something wrong?
 
Between normal operation that something blew in the pool overnight, or the 1 drop test varience, 0.5 is effectively 0 at TFP. (Also partly why the 0.2 resolution of the 25ml sample doesn't return any useful gains).

It's also why we allow a 1 ppm loss overnight without particular concern. It takes more than 1ppm loss to be sure there's a problem. You didn't have any overnight loss at all, so you passed with flying colors. (y)

If you successfully completed a MA slam after a normal slam, (please confirm) it's advised to run higher targets for a while to ensure it doesn't return.

Screenshot_20240814_073734_Chrome.jpg
 
What is MA slam? Is that specifically for yellow mustard issues after chlorine slam?

Or did I miss something in slam process regarding use of MA?
 
Ok. Glad I mentioned it. After completing a regular slam with FC at 40% of the CYA, those with mustard algae go 24 hours at 60% of their CYA. Then run a higher target for some time as insurance.

The good news is that mustard algae is rare and with the pool store using it as a catch all to blame when their flawed methods don't work, most who think they have it don't actually have it.

The bad news is that it's still a thing which happens to some.
 
where does the MA slam come in? is that because anticipating high TA/pH levels after completing chlorine slam?

learning myself and that's new terminology to add to my repertoire. :cool:
 
Newdude said:
Between normal operation that something blew in the pool overnight, or the 1 drop test varience, 0.5 is effectively 0 at TFP. (Also partly why the 0.2 resolution of the 25ml sample doesn't return any useful gains).

It's also why we allow a 1 ppm loss overnight without particular concern. It takes more than 1ppm loss to be sure there's a problem. You didn't have any overnight loss at all, so you passed with flying colors. (y)

If you successfully completed a MA slam after a normal slam, (please confirm) it's advised to run higher targets for a while to ensure it doesn't return.
Click to expand...
I didn't realize there was a stronger chlorine requirement due to the mustard algae, therefore I only ran the SLAM @ 20ppm.
Newdude said:
View attachment 603997
Click to expand...
 
datadr93 said:
I was reading MA as Muriatic Acid
Click to expand...
That's partly on me. We interchange the abbreviations based upon the discussion. Now that you point it out, a pool with mustard algae that needs muriatic acid to lower the Ph in order to slam, in Massachusetts, might be a tad confusing. :ROFLMAO:
 
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After my successful SLAM (at least I thought it was) I had a drop from 19.5 ppm to 9 ppm within 24hrs.
I was expecting my reading this morning to be approximately 15 or thereabouts... but 9!!! It's like something (bad organic) is still in the pool.
I passed the OCLT yesterday and this morning I had nothing in the form of CC.
I'm not freaking out, I would like to know why I'm losing 10 ppm chlorine if my pool is free of organic material.
Please provide some insight and thank you.
 

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