An Introduction to My Pool - Old Plaster - Old Pool - Black Algae !

Baxabillion

Active member
Jul 23, 2021
30
New Orleans, LA
Hi all,

I have been reading the forum for several years now. I follow as much advice as is practical. My schedule often puts me away from very long stretches so sometimes things get out of hand as my wife is not too interested in learning about the pool. When I am gone she will back wash and take a picture of a multi strip for me so I can tell her what to add as best I can.

Hopefully you all can help me with my pool. My plaster is bad and I am curious about the best path forward here for the pool as a whole and curious what y'all would expect whatever recommendations to cost.
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  • Pool Stats - Pictures attached
    • o Kidney Pool with 9' deep end
    • o ~18,000 Gallons
    • o Likely Build Date - 1980s???!!!
    • o Replastered at least once long before I bought the home.
    • Lots of old stains; from before my time.
    • o Sand Filter - Replaced the sand myself with Zeosand a few years back
    • o Pump system doesn't leak that I can tell
    • o Pool leaks once water gets above a certain level on the decorative tile
    • o South Central US
    • o No Shade - Direct Sun most of day
  • • Maintenance Regimen Currently
    • o Pending my cya and calcium will use - tabs, cal hypo or liquid to chlorinate
      •  right now keeping 1 tab in the floater and adding cal hypo
    • o Add 1/2 cup of Dia. Earth to filter and a splash of superblue clarifier to improve filter performance after every backwash
    • o Borates ~50 ppm
    • o Do my best to keep chemistry balanced with Muriatic acid and baking soda
    • o Trying Borates to see if they reduce chlorine demand.
    • o Had a high phosphate problem at one point many thousands of ppm. So i treat annual with the PR-10000
      •  I noticed that with the high phosphate i basically had no room for error with the chlorine;I would get a super bad bloom the second it dropped below the required level
  • • Current State
    • o Just got water clear after it being a literal swamp from fall through winter; been slamming it
      •  Just said screw it as far as taking care of the pool over the winter.
    • o Previously have had issues with black algae; never really fixed it
      •  Its back and better than ever!
    • o Plaster pitter and cracking definately needs to be resurfaced at a minimum
  • Current Chemistry - Leslies vs My Taylor Drops - X/X
    • o pH - - 7.9/7.8
    • o Free Chlorine - 12.39/15
      •  Total Chlorine Same
    • o Alkalinity - 88/ (90 to 100)
    • o Borates - NA /50ppm
    • o Cya - 39/30
    • o Iron/Copper/Phosphates - 0 ppm
  • My Questions
    • o Given the poor state of the plaster is there much to be done with the Black Algae
      •  Would bleaching the whites in my pool do the trick. (50 lb pail of Cal Hypo?)
    • o Other than looking like Crud and consuming sanitizer is there anything dangerous about it?
    • o If I don't replaster the pool this winter would mixing a up a pumper of Jomax and bleach and following that up with a pressure washer be my best option?
      •  I would also not let the pool go to heck after.
    • o Given the the bad delamination of the latest coat of plaster what would be the best most economical to handle the replastering.
      •  A friend who is a contractor recommended ripping the whole thing out; he is not a pool professional, but a thoughtful guy who is currently DIY re-doing his own kidney pool; jack hammering out all the old plaster. He said this would cost ~$80,000.
      •  His reason being the water intrusion behind the top coat of plaster from the delamination
      •  He also said it would probably be cost prohibitive for me to do what he is doing with the aid of guys he already has on the payroll.
    • o Considering whatever y'alls recommendations are about the pool/plaster. Would yall recommend upgrading the pump and filtration system from sand?
      •  I got way ahead of myself a couple years back now and now have a CircuPool RJ+ Series Saltwater Chlorine Generator on hand.
    • What is all this going to cost me!?!?!?!?!
Thanks

-Andy
 
What is your CH? That was not shown in the test results. If you use cal-hypo a lot then I expect it to be high.

I am not sure you have black algae based on your photos. You may have staining.
Also You should never exceed the SLAM value for FC for a given CYA.

Your pool is due for a replaster. You should chip it all out. I plaster company can do that. I do not expect it to cost $80k. I think that is way high. Some recent bids by other members show a new pool (digging, equipment, etc) is under $80k. Suggest you get 2-3 bids to put it in perspective. Obviously the type of plaster you go back with will influence the price, such as a pebble, but a standard white plaster with a full chip out of existing plaster I would expect to be under $20k (my estimate only).
You need to find why it is leaking at the tile level. That may be a little extra but have it all fixed if you put in new plaster.
 
Thanks for the quick answer Herm. My CH wa 200/275 leslies vs drops. Which is why im using the cal hypo since i have room to run.

I see now that my pictures suck. They arent stains. i can scrap it with my finger nail and they turn a little green befire i clear the whole spot. Also i have some larger pits that fill up with the soft black algae that i have dug out before. There are 2 of these in the 5th pic.

Whats the risk going over SLAM? I was targeting 12. My cal hypo may be a little stronger than listed.
 
  • o Given the poor state of the plaster is there much to be done with the Black Algae
    •  Would bleaching the whites in my pool do the trick. (50 lb pail of Cal Hypo?)
See this thread...on the black algae.

For any other stains, check this out...


  • o Other than looking like Crud and consuming sanitizer is there anything dangerous about it?
No.
  • o If I don't replaster the pool this winter would mixing a up a pumper of Jomax and bleach and following that up with a pressure washer be my best option?
    •  I would also not let the pool go to heck after.
See thread above.
  • o Given the the bad delamination of the latest coat of plaster what would be the best most economical to handle the replastering.
    •  A friend who is a contractor recommended ripping the whole thing out; he is not a pool professional, but a thoughtful guy who is currently DIY re-doing his own kidney pool; jack hammering out all the old plaster. He said this would cost ~$80,000.
    •  His reason being the water intrusion behind the top coat of plaster from the delamination
    •  He also said it would probably be cost prohibitive for me to do what he is doing with the aid of guys he already has on the payroll.
There is no need to ripping the whole thing out, unless you mean ripping out the plaster. We don't call is a rip out. However a full chip out and replaster IS recommended.

o Considering whatever y'alls recommendations are about the pool/plaster. Would yall recommend upgrading the pump and filtration system from sand?
What make and model of pump and filter do you have? Can you take pictures? If they are working, why upgrade?
    •  I got way ahead of myself a couple years back now and now have a CircuPool RJ+ Series Saltwater Chlorine Generator on hand.
Get that hooked up!!
 
Last edited:
So Bid #1 - from the guy everyone has recommended
$7000 - Replaster pool in Regular white marcite
Remove the plug of he main drain to let in ground water release
Prep work; remove plaster to the gunnite shell, haul away all trash; Acid wash surface

$1600 - Retile pool water line (remove and install) Labor only
$1180 - Waterline 6x6 tile materials
$480 - Regrout all coping edge around pool
$1460 - Install new LED pool light

Grand Total - $11,720 - Seems Reasonable. Thoughts??

Optional -$700 for the Gray Dye.
 
So Bid #1 - from the guy everyone has recommended
$7000 - Replaster pool in Regular white marcite
Remove the plug of he main drain to let in ground water release
Prep work; remove plaster to the gunnite shell, haul away all trash; Acid wash surface

$1600 - Retile pool water line (remove and install) Labor only
$1180 - Waterline 6x6 tile materials
$480 - Regrout all coping edge around pool
$1460 - Install new LED pool light

Grand Total - $11,720 - Seems Reasonable. Thoughts??

Optional -$700 for the Gray Dye.
This seems reasonable. It is recommended to obtain at least 2 bids, 3 preferably.
It is important to get a full chip out of the existing plaster which is indicated by Bid #1
It is also good to see that removal of waterline tiles, re grouting and replacement as you indicate that is where you may have a leak.
 
Thanks Herm. He offers Quartzscapes as well for a ~$2000 more looking at the info it takes the life of the plaster up to 20 years with proper maintenance. Seems like a no brainer to add that. And this price also seems reasonable.

One of the main drivers for using this guy is that he is who has been recommended to me by more than one person. He also installed the pool of one of my neighbors.

He said he can been finished in 4 days and can start the day after Easter.
 
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Thanks Herm. He offers Quartzscapes as well for a ~$2000 more looking at the info it takes the life of the plaster up to 20 years with proper maintenance. Seems like a no brainer to add that. And this price also seems reasonable.

One of the main drivers for using this guy is that he is who has been recommended to me by more than one person. He also installed the pool of one of my neighbors.

He said he can been finished in 4 days and can start the day after Easter.
4 days seems a little quick. It is a manpower issue for the chip out and tile removal. Plaster takes at least 1/2 day.
Keep us posted and put some photos of the progress each day if you go with him.
 
I am having quartzscapes installed for the plaster, getting the tile replaced and regrouting and repairing the coping for a Grand total of $13,360.

They are draining the pool as we speak. There is crew of 6 or 7 ready for the chipout which is expected to last through tomorrow.

They will then re-tile regrout the next day and plaster the following day.

He stated to fill the pool immediately adding shock and balancing the water and wait 4 weeks before going to the saltwater conversion.

1st of many pictures to follow.20250421_094458.jpg
 
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I am having quartzscapes installed for the plaster, getting the tile replaced and regrouting and repairing the coping for a Grand total of $13,360.

They are draining the pool as we speak. There is crew of 6 or 7 ready for the chipout which is expected to last through tomorrow.

They will then re-tile regrout the next day and plaster the following day.

He stated to fill the pool immediately adding shock and balancing the water and wait 4 weeks before going to the saltwater conversion.

1st of many pictures to follow.View attachment 639501
Are you sure they’re chipping out all of the old plaster for that price? Seems like really good deal if so.

Generally chlorine is not supposed to be added for at least a few days after plaster install. You might get instructions in writing from the quartz supplier.
 
Are you sure they’re chipping out all of the old plaster for that price? Seems like really good deal if so.

Generally chlorine is not supposed to be added for at least a few days after plaster install. You might get instructions in writing from the quartz supplier.
He is taking it down to the Gunnite. As far as the price, I don't live in an exceptional area of the city and I find I often get better deals than family and friends who live uptown. I printed out the NPC Start Up Procedures - It says to wait 48 hrs for the chlorine. Googling provided no specific guidance on quartzscapes product.
 
Last edited:
So. They seem to be on track to have this pool completed by say Thursday of this week. I have the NPC recommended start up procedures here in front of me and am reviewing in preparation. This quartzscapes website led me there. Attached. Thread for my pool plaster below.

  • I have 3 hoses available to fill the pool with. Intend use all three covering the ends with a rag and snaking them to the bottom of the deep end. I'll attempt to run all 3 to fill a 5 gallon bucket to get a rate to see how long this will take.
  • Fill water chemistry as of today is as below - Any special considerations considering these #s? Do I need to attempt chemistry modification while filling for the pH?
    • pH over 8 - 5 Drops to bring down to 7.4 - Does this need to be managed during fill?
    • CH - 112 - This is over range per the sheet - Not sure how to bring down or if too high?
    • Total Alkalinity - 95 - The muriatic acid required to get the pH in range should take care of this.
    • Balance chemistry as per the daily program
  • Run pump 24/7
    • presumably backwashing pretty regular.
  • Once full I will retest and test for metals
    • Sample to Pool store for the metals - to save money on kits
    • What are opinions on sequestrants for Step 7.
  • Brush pool 2 times a day for the 1st 7 days.
    • No wheeled vacuums for 28 days
    • Need to get a brushed vacuum
  • Day 4 says to begin adjusting CYA to 30 to 50 ppm
    • Its worded strangely.
      • Do i add 10 ppm per day for 3 days to get to 30?
    • Do I follow Day 1 route for CH here brining up 10 ppm at a time waiting several hours between each?
  • The Orenda App has me covered for the LSI calculation
  • Pool Math for everything else
 

Attachments

  • npc-pool-start-up-english.pdf
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