Pool Gear for a new pool?

You should be fine with the 40. If will make 9.3FC running 24 hours at 100% in your pool. (don't ever run 24/7 at 100% for days, not good for the cell).
With your VSP, even on really high demand days, you can run 50%, 24/7 and make 5 FC. You are fine.
@wireform is pointing out that a bigger cell (IC-60) allows you to run lower %, and that can extend the life of the cell. It can also make more in a shorter period of time...just gives you more flexibility.
If they will swap it, take it. If not, don't sweat it.
Good deal, and thanks for the reply.. I will definitely consider that in the future.
 
You should be fine with the 40. If will make 9.3FC running 24 hours at 100% in your pool. (don't ever run 24/7 at 100% for days, not good for the cell).
With your VSP, even on really high demand days, you can run 50%, 24/7 and make 5 FC. You are fine.
@wireform is pointing out that a bigger cell (IC-60) allows you to run lower %, and that can extend the life of the cell. It can also make more in a shorter period of time...just gives you more flexibility.
If they will swap it, take it. If not, don't sweat it.
Does it matter what speed the pump is running at to achieve that number?
 
Measuring equipment never seems to get mentioned.

Get a cheap kitchen scale. One that will go up to at least a pound.

Get a 2 quart clear plastic pitcher with ounce gradations on the side

Get a clean 5 gallon bucket

The scale is to measure things such as CYA and Baking Soda
The pitcher is for things like bleach and acid
The bucket is for adding acid to water before your put it in your pool (opinions vary on that one - I dilute my acid before adding, others just add it, there are safety and chemical considerations with both ways)


Also handy is a dedicated sample cup. If you are going to run a bunch of tests, it is nice to have a 2-3 cup container that you can use to collect enough pool water at once to run all of the tests as well as rinse out the test cylinders.
 
Measuring equipment never seems to get mentioned.

To be contrary to laboratory grade best practice, I rarely measure.
Get a cheap kitchen scale. One that will go up to at least a pound.

Yup, I use one of those to put filled socks on to know how much CYA is being added.

Get a 2 quart clear plastic pitcher with ounce gradations on the side
Get a clean 5 gallon bucket
The pitcher is for things like bleach and acid
The bucket is for adding acid to water before your put it in your pool (opinions vary on that one - I dilute my acid before adding, others just add it, there are safety and chemical considerations with both ways)

At 35,000 gallons I know 1 gallon of liquid chlorine adds 3 PPM to my pool.

The OP has 20,000 gallons. 1/2 gallon of liquid chlorine adds 3ppm. 1/4 gallon adds 1.5 ppm. Put it a few times and you learn about how much is 1/2 gallon or 1/4 gallon. A bit over or under is not a big deal.

Similarly, 1/2 gallon of 31% acid is a 0.4 drop in pH. That lowers my pH 8.0-8.2 to 7.4-7.6.

For the OP 1/4 gallon of acid will lower pH by 0.4

The less handling of acid the better.

Small pools and spas need different techniques. With a large pool you can eyeball most chemical additions with a bit of practice.
 
Measuring equipment never seems to get mentioned.

Get a cheap kitchen scale. One that will go up to at least a pound.

Get a 2 quart clear plastic pitcher with ounce gradations on the side

Get a clean 5 gallon bucket

The scale is to measure things such as CYA and Baking Soda
The pitcher is for things like bleach and acid
The bucket is for adding acid to water before your put it in your pool (opinions vary on that one - I dilute my acid before adding, others just add it, there are safety and chemical considerations with both ways)


Also handy is a dedicated sample cup. If you are going to run a bunch of tests, it is nice to have a 2-3 cup container that you can use to collect enough pool water at once to run all of the tests as well as rinse out the test cylinders.
Thats a good point and relatively cheap add on. I will get those things on the list.
 

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At 35,000 gallons I know 1 gallon of liquid chlorine adds 3 PPM to my pool.

The OP has 20,000 gallons. 1/2 gallon of liquid chlorine adds 3ppm. 1/4 gallon adds 1.5 ppm. Put it a few times and you learn about how much is 1/2 gallon or 1/4 gallon. A bit over or under is not a big deal.

Similarly, 1/2 gallon of 31% acid is a 0.4 drop in pH. That lowers my pH 8.0-8.2 to 7.4-7.6.

For the OP 1/4 gallon of acid will lower pH by 0.4

The less handling of acid the better.

Small pools and spas need different techniques. With a large pool you can eyeball most chemical additions with a bit of practice.
Those are some numbers! I will definitely save it, but I think i am a ways off from eyeballing it still. I am still trying to remember what things like CYA mean without having to look them up every time lol.
 
Those are some numbers! I will definitely save it, but I think i am a ways off from eyeballing it still. I am still trying to remember what things like CYA mean without having to look them up every time lol.
After many years of being a pool boy you get the hang of it.
 
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