QPSUtah said:

Base Demand requires 9 drops to raise pH to 7.4.

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9 drops of base demand increases the TA by 33 ppm.

The TA starts at 30, so most or all TA is probably CYA.

Address CYA and TA and the pH will fall in line.

SO much knowledge in the house! So many used for this knowledge! LOVE IT!

I looked at your PM logs. It shows 1 puck added 3 weeks ago, another puck added 2 weeks ago and a 3rd puck added 6 days ago. You also tested CYA 6 days ago and it was 60ppm.
Each puck adds 3ppm of CYA per calculations.

Losing 3-5ppm of FC is about right for summer, high UV in Austin. Therefore continue to add LC daily to maintain the FC in the target range.

The use of LC will decline when the seasons change to Fall then to Winter.

If you were to use pucks on a continuous basis, you would need to put a stack of them in. Each puck adds 4.9ppm of FC (when fully dissolved). This would be one puck a day fully dissolved to meet your FC loss demand. They do not dissolve that quickly, therefore the need to have a stack of them to get the effect of 1 on a daily basis. This is why puck chlorinators hold 6-10 pucks. Then you add more weekly. However as you can see, you will also be adding 3ppm of CYA per puck. So that could be 15ppm or more a week increase and your CYA will be skyrocketing high in a matter of several months.

Based on the FC/CYA Levels, you need to keep your FC level higher and higher. If not, then you risk algae, plus you have to drain the pool to reduce CYA.
This is why liquid chlorine is preferred or even better install a SWCG.

paul1971 said:

Sorry, i am not understanding your answer

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Your cell at its current setting is set too high. Adjust it.

JessBlount617 said:

I can’t believe how much bigger going from 16 to 18’ was

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Circles are fun. Going 1/8 or 12.5% larger on 16ft gets a little over 25% more surface area.

It won't come into play often with pools, but it could come into play every Friday night at various Pizza places.

1poolman1 said:

Did you have the "rain" effect or a "sheer?" The sheer is available here according to the website:

Jandy 6" Extended Lip Sheer Arc Waterfall 1218CSA - Clear Lip - Online Swimming Pool Supply Store & Warehouse

Jandy 6″ Extended Lip Sheer Arc Waterfall 1218CSA – Clear Lip Sheer Arc Waterfalls can be positioned just above the waterline, no raised bond beam required, making it perfect for vinyl liner pools.The fall projects up from the unit at a 45 degree angle and then naturally arcs and descends to the...

www.goodsunplay.com

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FYI. This is a fraudulent website. I placed an order a week ago. They charged more than the total order amount, but they use Paypal, so I have a dispute filed there. They never sent an order confirmation. They did not ship the part. They do not respond to emails. Complete scam. Be careful.

On the bright side, this Jandy part number is the right part, and is still made by Jandy and in stock. I can't buy direct from Jandy, but my local pool store has ordered the part. Thanks for the help.

Newdude said:

The more it produces, the less you need to run it, the longer it takes to reach its hours of in use lifespan. Something something gift horse. And they never make more than their fair share, so youre calculating the production or the daily UV loss wrong.

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Sorry, i am not understanding your answer

Check for signs of mice in the heater.

I wish there was ANY identifying mark on the pool. When I bought the house, the solar heater receipt was in there and it said 10k, but that was added well after the pool. Leslies said 13k based on dimensions, but the same guy tried to explain how I could turn my swg off because it wastes salt and the salt is what keeps algae away, and that's how he keeps his own pool so clean, so yeah... I base calculations on the low end of 10k, to err on the side of caution, but it always seems low, so pretty sure it's bigger than 10k.

That said, good points above. I'll add the second bag now, test on Monday evening, and go from there. Thanks!

Skenn81 said:

What an adventure this is...

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The life of a Beta tester can be wild. But the greater community thanks you for your contributions to progress.

paul1971 said:

Yes it is working but wonder if its working too much

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The more it produces, the less you need to run it, the longer it takes to reach its hours of in use lifespan. Something something gift horse. And they never make more than their fair share, so youre calculating the production or the daily UV loss wrong.

JessBlount617 said:

She’s up! I can’t believe how much bigger going from 16 to 18’ was. I can’t imagine what I would do if I had gone 20’!

I’ll throw some water in to get it weighed down. And then professional fill comes this week!! I could not be more excited!!!

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Good choice on the water! You have been through enough! Happy Mother’s Day

Most likely, the "Adjusted" or Carbonate TA is zero.

What is the CYA?

Borates and Adjusted Alkalinity​

Adjusted TA = TA – (CYA X CYA C.F) – (Borate x Borate CF)

Borate C.F (correction factor) based on pH.

pH.......CF

7.2.....0.051

7.4.......0.0786

7.6......0.1248

7.8......0.1989

Cyanuric Acid correction factor based on pH.

pH........CF

7.0.......0.22

7.1.......0.24

7.2.......0.26

7.3.......0.28

7.4.......0.30

7.5.......0.32

7.6.......0.33

7.7.......0.34

7.8.......0.35

7.9.......0.36

For example, if the pH = 7.6, TA = 90, Borate = 50 and CYA = 70, the adjusted alkalinity is 90 - (70 x 0.33) – (50 x 0.1248) = 60.66.

She’s up! I can’t believe how much bigger going from 16 to 18’ was. I can’t imagine what I would do if I had gone 20’!

I’ll throw some water in to get it weighed down. And then professional fill comes this week!! I could not be more excited!!!

Typically due to chlorine interference.

High CYA slows the process.

Most likely the CYA is well over 100.

Can you post a full set of readings including CC?

Was FC tested with FAS-DPD?

Post current readings and also prior readings.

Post all chemicals added since prior readings.

Is the pool on Trichlor or liquid chlorine or salt etc?

As you go forward you can use your acid additions & subsequent results to help dial in your volume in poolmath. Acid doesn’t degrade like liquid chlorine so it can be a little more accurate of a judge.
If you know the make & model of your pool the manufacturer should be able to provide you with a volume also.