Replacing water...confuzzled!

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DeanP66 said:
Just realize that an acid wash eats away a layer of the plaster so if it's long in the tooth or it's been acid washed before, you might be better off skipping it.
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Thanks for the advice. I decided to skip it, at least for this season. This pool is old and its history is unknown, but I do see a fair amount of pitting where the black algae has been hanging out, and that is concerning. I'd rather not acid wash it until we get at least a full year under our belts while taking care of it properly and see where we land. I think we can evaluate it better at that point. It might just need to be completely refinished....need to do more research on that.
 
@cowboycasey turned me on to this idea.

I would get a 2 gallon pump sprayer and while the pool is drained and you have hit the black algae with the brush spray some diluted LC directly on those spots to help kill it. Repeat a couple of times, brush, spray, brush, spray.

If you have already filled your pool, I would still use the same pump sprayer to spray some full strength LC on the black algae spots. Same thing here brush, spray, brush, spray.
 
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It should work great for what you got going on... Your doing a SLAM anyways, might as well spray the chlorine exactly where you need it on the side of the pool where all the black is :)
 
I've read that direct chlorine on the pool wall can stain it... Or rather bleach it... So as tempting as it was, I didn't want to do that. I suppose I could have diluted it as you suggested. But I'm not sure how to safely use a pump sprayer with chlorine. But I can see pouring the liquid chlorine into those specific areas and then brushing actively right after pouring in the chlorine. If there's a better way please enlighten me!
 
Put water in the pump sprayer, then put chlorine in it. Pump, then spray. If you have not filled your pool yet, I think that would be really good idea.

If you pool is filled, full strength chlorine, pump spray. The water in the pool will dilute it before any damage can be done.

Brush algae before you spray. Then brush after you spray, and spray again. To get rid of it all you will have to do this multiple times.
 
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For the pump sprayer, are we talking about something like this?

I will admit I was pretty anxious to get the pool filled back up because I have to go back to work on Monday and need to keep this train moving forward. So I did it...it's still filling (at about 16-18 gpm) and will be done later today.

I reminded myself that the whole reason I drained was to lower CYA so that the LC can do its job on the algae. A side benefit was removing a large portion of the green algae to make that job easier. But the pool has had low FC since long before we moved in, I'm sure of it. So this is new chemistry situation is going to be a whole new ball game for the black algae...one I intend to win. And...I've got a lot of scrubbing to do regardless of whether the pool is full or empty, so "full" it is.

:shark:

My next plan is to vacuum as much of the sunken crud out of the deep end as possible after it gets full, and then start officially start the SLAM. I work from home, so I can monitor it regularly.

Here's a picture from just before draining (I was experimenting with steel brush vs regular brush, hence the "stripes" on the bottom) and the current status. In the current picture, the water looks much more inviting! Until you get to the deep end...lol

IMG_20210604_124157.jpgIMG_20210606_114847.jpg
 
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Ok.....the pool is full and I added 3 gal of 10% LC. FC level is at 15??? Does that sound right or did I mess up the test? I poured the LC in by the incoming water jet, waited about an hour (and brushed the pool in the meantime).

The 2nd part of the test was for CC and the 5 drops did nothing at all, so I assume that means CC is 0?
 
That sounds right. And yes no CC. But CC at this point dont matter. You clearly have algae and lets focus on that.

What is your current CYA level, and then lets get your pool to SLAM level.

You will also need to brush that black algae like crazy so we can get rid of it.
 
Ok, I'll do that CYA test and report back shortly. CYA test is ZERO!

So now what? Do I have to add CYA?

Now a question about daily vacuuming during SLAM. I have read these three things;

1. keep the filter running constantly
2. daily vacuum
3. when dealing with algae, vacuum to waste.

I have a cartridge filter system without a multi-port valve. In order to vac to waste without using the filters, I have to remove the cartridges and set up a contraption in the tank to prevent the water from going back into the pool. It also takes two of us to ensure that the pump doesn't run dry. This is a big project with a lot of heavy lifting, so I just want to be sure that I'm understanding correctly, and not just creating extra work for myself.
 
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