My Metal Staining/Ascorbic Acid/Drain/Fill Plan: Looking for Review/Help

phappy

Well-known member
Aug 25, 2013
67
Hey all. I have learned much from reading various articles and posts on TFP and have formulated a plan (see below) to remove the iron staining (tested with Vitamin-C rub) from my pool. Does this look solid?

OBJECTIVE: To remove as much of the metals in my pool as possible, with the understanding that I can't get ALL the metal out because I dare not drain ALL the water from my vinyl liner pool (because doing so would risk extreme damage & cost to the vinyl liner)

PLAN:

- Add the appropriate amount of ascorbic acid to the pool, let it circulate satisfactorily and also scrub liner with a brush.
- Use sequestrant to hold the metal in suspension (that is only IF a sequestrant is truly needed for the short time the water will be in the pool)
- Drain water directly from vacuum positioned at the bottom of deep end. I believe I read that when trying to remove metals from your pool, you should suck the water from the lowest section of the pool.
- Drain the water, but only a "safe" amount that doesn't put the liner in jeopardy. My thought was do drain the water down to slightly above the bottom of the shallow-end.
- Refill the pool with water (after having the town test my water to ensure it is metal-free)

I would then like to repeat this entire process a few times. This way, I am “halving” the amount of metal in the water each time and eventually will get to a place where the metal amount doesn’t stain the pool as noticeably.

QUESTIONS:

- Does my idea of draining the water down to almost the bottom of the shallow end seem safe in protecting the vinyl liner from potential damage? Or would you suggest a different level to drain to?
- How many times do you suggest I repeat the entire process of draining/filling (approx. ½ the pool volume each time) to get a a point where the amount of metal remaining in the water has been so diluted that it doesn’t stain the pool too noticeably?
- Is using a sequestrant like Jack’s Magic The Pink Stuff (which is expensive) really required? Because I plan to immediately start draining the water once the ascorbic acid well circulated and staining has lifted.

Thank you my friends for reading this and for your thoughts and advice!

Info: Pool is Vinyl liner. 26,730 gallons. 18’ x 36’.
Below is an image of the pool's dimensions (as best as I could measure). The bottom-most image illustrates the pool's depth. And the shallow end has approx. 37" of water (but I forgot to write it down).



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Have you looked at the No Drain Exchange as described in Draining? - Further Reading

If your water parameters are good, you can get a relatively efficient exchange with 1.1 to 1.2 times water volume.

Remember that the AA consumes the chlorine in the water first. So doing this when the water is cold allows for less likely chances of algae.

I have no idea on the sequestrant. Likely you would be wise to use some polyquat60 algaecide as the FC will be zero for several days.
 
Have you looked at the No Drain Exchange as described in Draining? - Further Reading

If your water parameters are good, you can get a relatively efficient exchange with 1.1 to 1.2 times water volume.

Remember that the AA consumes the chlorine in the water first. So doing this when the water is cold allows for less likely chances of algae.

I have no idea on the sequestrant. Likely you would be wise to use some polyquat60 algaecide as the FC will be zero for several days.
Hi mknauss. Thanks so much for your reply and helpful information. I did not know about the 'Draining - Further Reading' section, so thanks for directing me to it. I am very interested in the No Drain Exchange process. I will investigate that further. I'll have to better understand the formula for Total Disolved Solids (TDS).

I was thinking of doing this when the colder weather comes to my area and when I'm going to close the pool for the winter. It seems it would be the best time for this process.

Thanks again for your reply & help.
 
In reading the "No Drain Exchange" process, I've a few questions about the Total Dissolved Solids (TDS).

Usually of course, I pay no attention to TDS when Leslie's tries to sell me a product. Hah. But in this "No Drain Exchange" process, knowing the TDS of both your pool water and hose water is key.

I first plan to let the chlorine ppm level drop down to 'barely there' before doing this process. Then I will add the appropriate Ascorbic Acid (to lift the stains into solution) and then will probably add Sequestrant.

Does adding the Ascorbic Acid and Sequestrant raise the Total Dissolved Solids? My guess is 'yes'.
 
For your pool water, salinity + CH is good enough for TDS.
Most municipal tap water has a TDS of about 200.

The dominating factor is the water temperatures. A significant difference in water temperatures (20F or so) will make the process quite efficient.
 
For your pool water, salinity + CH is good enough for TDS.
Most municipal tap water has a TDS of about 200.

The dominating factor is the water temperatures. A significant difference in water temperatures (20F or so) will make the process quite efficient.

Okay, thank you for informing me mknauss. A great help!
 
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