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gcbpa, You are doing a great job! It is obvious you are reading and following the advice on this forum, Follow the SLAM article meticulously and you will have a crystal clear pool very soon

What is your CH? This is just a guess but it looks like calcium scale with imbedded dirt. Solution would be to lower water level to expose it and clean with a wire brush or muriatic

hole in the vac hose?

Well, it seems it would shorten the life a little but I don't know what alternatives are available. The covers are short-lived anyway so I doubt you will see much difference.

Could you design the decking to rest on top of the Pool Wall but overhang enough to cover up the imperfections?

This could help https://www.troublefreepool.com/blog/2019/01/18/suction-side-air-leaks/

Your description is hard to follow so I'll just make this general statement...... Loss of prime more often than not is the result of a suction side leak This may help Suction Side Air Leaks

Is this a new installation? Pool looks used!

Welcome to the forum :wave: I would be just a bit more concerned. CH seems to build up more quickly than folks think and it's a pain to get rid of. 250 CH is enough and keeps you in the 250-400 range as recommended.

Poolstored, I understand. I wanted readers to understand that sometimes clarifiers work, (rarely ?) however, it is not included in TFP's suggested methods and I think you left little doubt about that.

The SLAM article is VERY specific about the factors required to be finished. Follow the SLAM article to the letter......you are NOT done,

TFP does not suggest clarifier. If often causes more complications but, in some cases (apparently yours included) it seems to work. Check your filter media when your SLAM is done making sure you are not gummed up. So progress from greenish to bluish is very good. Sounds like algae after all...

Are you really sure it's black algae? Got a pic?

Well, no. We use a process called SLAM to get rid of algae permanently. We never "shock" a pool. Here's more info https://www.troublefreepool.com/blog/2018/12/12/slam-shock-level-and-maintain/ https://www.troublefreepool.com/blog/category/pool-school/pool-care-basics/

I like ajw's sensible solution ! :mrgreen: :mrgreen:

First of all, high TA is completely unrelated to any algae..........repeating Texas Splash' advice that you stay out of the pool store. So, the first step we will ask you is to read Pool Care Basics Archives That get's you started on some basics. Then, you will see that we get rid...

Pump on, you get more flow across the seams, depositing more dead algae

Probably the dead algae is suspended in your pool water and sinks slowly and accumulates in the seams. However, that probably also means you have live algae that causes what you are seeing. A SLAM process is perhaps called for but a complete set of test results is needed to be...

Now, I am even more confused!

To me, green color has either meant algae (which I don't think you have) or iron?????? Do you fill from a well? Have you tested for iron?

Devilishly funny!

I am seeing some "cloudy" information in this thread 1. What are we checking at 10 minute intervals and why? I don't get that 2. Establish the CYA at around 30 and don't test it again until OCLT is passed......there is no need 3. Backwash only when psi increases 25% from clean......more...

Hold off on CYA until you pass an OCLT Just skimming this thread, you seem determined NOT to follow the SLAM process. Sorry to be harsh but meticulous detail to the process is required for it to work

Agreeing with mgtfp, it is logical to assume the two most recent reagent are correct. Also, we know that calcium does not appear magically in a pool unless someone puts it there (maybe with fill water) so that sorta confirms the last two tests. I can think of no reasonable answer to your CH...

Wow! I don't think we have EVER seen that on the forum before. It HAS to be organic so you would think chlorine would solve it permanently. Probably a type of mold rather than algae but chlorine would still be the answer. Can you manually vac them up? How big is the affected area?

How long have you noticed this? Can you scrape some off the pool surface and get a dark greenish color by smearing it onto a piece of white paper?

Double filtering does not seem like a particularly effective addition to me. Why are you thinking that will be helpful?

I didn't post very clearly above. I think the only things that could be worrisome is the sand is in solidified clumps or organic debris pile on top of the sand bed. I doubt you will find either, but a visual inspection will confirm that. There will likely be a small amount of debris but...

I suppose it could be clumped up badly but I doubt it. I believe you may have some debris on the top of the sand bed but that shouldn't be an issue. So you are really only checking the level of sand to make sure you have enough.

I am above my pay grade on this but I think it may be worthwhile to open up and inspect the multiport valve. There is a "wagon wheel" gasket inside that may not be seating properly and allowing the sand to leak around it. I would suggest you wait until someone else confirms that can be a...