What level of FC will degrade a liner

[richierich]

Hi All - I'm not talking about fading the liner, I mean like can degrade it to the point it starts to leak or break. I've had some stubborn algae and I've been maintaining my FC at about 12 but shocking up to 20 and I've noticed in spots it seems almost 'scaly' like an alligator instead of smooth. My numbers are as follows

FC 12
CYA 40 (just increased to 60)
PH 7.5
TA 40
Salt 3700

 

[mgtfp]

FC 20 was maybe a tad high for CYA 40, but I wouldn't expect liner damage from just a short term exposure. Mustard SLAM FC is 24 for CYA 40, which should be safe for short term exposure.

How old is your liner?

 

[RLP]

FC up to slam level is safe for people and equipment. I don't know that there is a particular number that will cause a liner to fail.

Did you slam and pass the three criteria?

Slam level for a cya of 40 is 16. 60 is low for a swcg. See the chart below for recommended levels.

with a small pool it might make sense to drain and refill.

 

[mknauss]

A great thread to review.

Chlorine Levels and Vinyl Liner

Because of my job (Insurance Underwriter) I was able to attending the Pool and Spa Show in Atlantic City earlier this week. I'm shopping for a new liner and so this was a great opportunity to speak w representatives from the 3 biggest liner manufacturers/distributors in the country. My biggest...

www.troublefreepool.com

 

[richierich]

FC 20 was maybe a tad high for CYA 40, but I wouldn't expect liner damage from just a short term exposure. Mustard SLAM FC is 24 for CYA 40, which should be safe for short term exposure.

How old is your liner?

liner is 6 years old and scaly in some parts and not smooth