Long Time/First Time

Glad the genie works ok for you.

We generally recommend using muriatic acid as dry acid contains sulfates which can build up in the water & cause various issues to concrete & metals. The risk is less with a vinyl lined pool that has no swcg or heater or uses low amounts & water is regularly exchanged which may be applicable in your case.

Liquid chlorine or a swcg are THE TFP recommended methods for daily chlorination in all pools.

Any unadulterated / plain sodium hypochlorite will do. The easiest to find is dedicated liquid chlorine in the pool section at hardware and big box stores or pool stores (sometimes available there in refillable containers) - it’s generally 10-12% strength & a better value than household bleach which is generally 3-6%
You would add as needed to maintain your fc above minimum for your cya at all times. Replace what is lost each day before falling too low just as you do now. Your fc demand will be no different. Maintain target range fc FC/CYA Levels
Use PoolMath to calculate amounts based on the strength you are using.

Great. I very much appreciate all your info! To address my new vinyl liner fading concerns and the design of the Aqua Genie, I will pour in from a low level just above the water and not near the AG combined inflow/outflow, and brush brush brush sides and floor in areas where poured. OK to also dilute the liquid chlorine first in a bucket as an added precaution?

BUT!!!! I was just about to start pricing the best place to get liquid chlorine near me when I pulled out the spec sheet from the vinyl liner manufacturer. It says keep FC 1.5-2.5! This is way lower than TFP recommends for my current CYA level of about 50.
Glad the genie works ok for you.

We generally recommend using muriatic acid as dry acid contains sulfates which can build up in the water & cause various issues to concrete & metals. The risk is less with a vinyl lined pool that has no swcg or heater or uses low amounts & water is regularly exchanged which may be applicable in your case.

Liquid chlorine or a swcg are THE TFP recommended methods for daily chlorination in all pools.

Any unadulterated / plain sodium hypochlorite will do. The easiest to find is dedicated liquid chlorine in the pool section at hardware and big box stores or pool stores (sometimes available there in refillable containers) - it’s generally 10-12% strength & a better value than household bleach which is generally 3-6%
You would add as needed to maintain your fc above minimum for your cya at all times. Replace what is lost each day before falling too low just as you do now. Your fc demand will be no different. Maintain target range fc FC/CYA Levels
Use PoolMath to calculate amounts based on the strength you are using.

Thanks so much for all of your advice. Very much appreciated - wish I found TFP years ago.

To address my vinyl fading concerns with my new liner, I will pour in liquid chlorine from a very low height and brush brush brush the sides and floor near where I add the liquid chlorine (but away from the lone Aqua Genie inflow/return spot). OK to also dilute the liquid chlorine in a bucket to offer further protection?

Pool Math shows how much Liquid Chlorine raises salt (is that a concern?) but makes no mention of impact on ph. I've read how liquid chlorine does raise ph. Is the amount negligible that Pool Math doesn't show it?

But!!!!! I was just about to start looking at price and availability of liquid chlorine near me when I pulled out the vinyl manufacturer's care sheet (actually from the "Chemical Fabrics and Film Association" in Cleveland). It says keep FC at 1.5-2.5 ppm - that is way lower than TFP recommendations even if I drop CYA to 30. Interesting they make no recommendation on CYA levels. Hmmmm. But now I'm hesitant to proceed.
 
Interesting they make no recommendation on CYA levels. Hmmmm
Manufacturers follow the industry recommendations.

The industry is a billion dollar industry based around selling chemicals, not keeping pools clean the cheapest way possible. They shun science in exchange for profits, and green pools are a cash cow.
 
There’s a fun post on an experiment with liners & chlorine- I’ll see if I can find it.
Until then rest assured that UV exposure will fade your liner long before tfp recommended levels will assuming you don’t allow liquid chlorine (or an other chem) to rest on your liner.
 
 
Wow, great thread...thanks for haring.
 
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