Vinyl Liners and FC ranges

[JamesW]

In other words, forget about the CYA's contribution to the TA. It really doesn't matter. Poolmath will take it into account when calculating the CSI if you want to know the CSI.

And, there's no set TA you should be targeting. Find the TA that works for your pool. The TA is good when the pH is stable.

 

[ajup2it]

In other words, forget about the CYA's contribution to the TA. It really doesn't matter. Poolmath will take it into account when calculating the CSI if you want to know the CSI.

And, there's no set TA you should be targeting. Find the TA that works for your pool. The TA is good when the pH is stable.

Thanks James. I was reading the SWG recommended ranges and that's why I have a myriad of questions and confusions.

 

[trickzo]

The wrinkles under the skimmer appear to me that the maybe the skimmer faceplate was installed too soon before the water was filled up to to that point. They do not appear to be a water chemistry-issue. As far as the information about the liner absorbing water comes from one the suppliers of the vinyl sheet material. Here are the links in case you want to review:

https://docs.wixstatic.com/ugd/4e4814_d643760abfec42d18b6b8fc212fd0790.pdf

https://docs.wixstatic.com/ugd/4e4814_2d179d33b21e4f418231ff6818df988d.pdf

https://docs.wixstatic.com/ugd/4e4814_e97008bf18d3476fadf0477d9fddc997.pdf

 

[ajup2it]

The wrinkles under the skimmer appear to me that the maybe the skimmer faceplate was installed too soon before the water was filled up to to that point. They do not appear to be a water chemistry-issue. As far as the information about the liner absorbing water comes from one the suppliers of the vinyl sheet material. Here are the links in case you want to review:

https://docs.wixstatic.com/ugd/4e4814_d643760abfec42d18b6b8fc212fd0790.pdf

https://docs.wixstatic.com/ugd/4e4814_2d179d33b21e4f418231ff6818df988d.pdf

https://docs.wixstatic.com/ugd/4e4814_e97008bf18d3476fadf0477d9fddc997.pdf

Thank you!!!

 

[JamesW]

My neighbors wrinkles had the whole winter to form, but the liner was as tight as could be. No loose sags or folds. Just a million random raised lines all over that looked like a finger print. This way and that way, with no change by the skimmers/return/top edge.

That type of wrinkling is due to very low pH. Usually due to trichlor use and zero TA and pH below 4.

The poster's wrinkles are not chemistry related. I suspect that they are due to ground water.

The wrinkles are not due to the skimmer faceplate being installed to early. If you install the faceplate too early, the liner gets stretched too tight. It doesn't make it too loose.

High chlorine does not wrinkle the liner.

Very low pH is the only chemistry that wrinkles the liner.

 

[ajup2it]

That type of wrinkling is due to very low pH. Usually due to trichlor use and zero TA and pH below 4.

The poster's wrinkles are not chemistry related. I suspect that they are due to ground water.

The wrinkles are not due to the skimmer faceplate being installed to early. If you install the faceplate too early, the liner gets stretched too tight. It doesn't make it too loose.

The pool company that installed it is claiming that my FC has been too high and therefore that's why my liner is wrinkled by the skimmer box. No floor wrinkles at all, which is what I've read when there's a pH issue.

 

[JamesW]

Agreed, your issue is not chemistry related. Your wrinkles are probably due to ground water.

 

[ajup2it]

So I tested my pool today and here's my numbers. Please let me know if I should adjust anything. I still have my SWG off so my FC will come down a little more, as it is still high. I'm aware that doing too much at once makes things harder to sort out (like handling a fish aquarium - which seems easier by comparison believe it or not). So I guess my goal here is to reduce my FC and maintain pH, mainly. But please correct my inexperience if you see anything else that your expert eyes feel need adjusted. After reading about Borates, it seems like it would be good to do, but I'm not sure how to go about it given my TA other than to play with adding MA and aerating for the next few weeks. Thoughts on this would be great too. Thanks guys.

FC = 6.5
CC = .5
TC = 7.5
CYA = 85-90 (do I go with the little dot being completely obscured or barely visible?)
TA = 140 (unless you calculate CYA into it then it would be around 80?)
CH = 400 (I added fresh water and this number increased. I gather I have hard water)
Salt = 28000

 

[mknauss]

Your FC is falling below Target level. Do not let it drop below 6 ppm preferably.

Ignore the CYA and TA thing. It is of no concern as JamesW explained.

When you do the CYA test, try this next time.

Once you have your solution ready, back to the sun, etc. Fill the vial to a line, say 80, lower the vial to your waist level and glance for the dot, you see it, add solution to the 70 line, glance, see it, repeat until you no longer see it with a glance. Then use the CYA value one step above the line you read. So if you stopped at 50, use 60 ppm CYA.

The vial is in logarithmic scale. So it is not viable to interpolate between the lines. Just use the whole numbers, such as 50, 40, 30, ....

 

[ajup2it]

Your FC is falling below Target level. Do not let it drop below 6 ppm preferably.

Ignore the CYA and TA thing. It is of no concern as JamesW explained.

When you do the CYA test, try this next time.

Once you have your solution ready, back to the sun, etc. Fill the vial to a line, say 80, lower the vial to your waist level and glance for the dot, you see it, add solution to the 70 line, glance, see it, repeat until you no longer see it with a glance. Then use the CYA value one step above the line you read. So if you stopped at 50, use 60 ppm CYA.

The vial is in logarithmic scale. So it is not viable to interpolate between the lines. Just use the whole numbers, such as 50, 40, 30, ....

Thanks Marty. I appreciate the guidance on CYA. I'll turn the SWG back on and monitor FC.