Thank you very much for the detailed answer.
I need to digest and learn a lot of information here.
From a quick read on the internet, both FreshWater AG+ Silver Ionizer and Zodiac 2 New Nature 2 are designed to help maintain water clarity and reduce the need for traditional chemical treatments like chlorine.
But their ingredients are a little different,
Nuture2 uses a combination of minerals, such as silver and copper, to release controlled amounts of sanitizing agents into the water.
whereas FreshWater utilizes only silver ions.
I have only seen a hot spring spa with FreshWater...
I didn't know my IP address was public here xD
I'm not familiar with the types of test kits, there are spa and pool equipment stores but I don't have the energy to start traveling and looking.. I checked eBay/Amazon and the prices are very high for Taylor Technologies K-2006 and LaMotte why do I need these test kits?
There are strips from Ali Express for 3 dollars like this:
Are they inaccurate? It's a spa at my house that 90% of the time only I enter.
I don't need precision levels of 9 digits after the decimal point (7.451285366 hahaha)
You are correct that my use of hydrochloric acid was not responsible, I put in a whole liter and after I came back the next day there was still limescale, I said it was probably not enough and added everything else. It may be that only when the PH is really low, the scale starts to decrease, but then there is a risk of damage to the spa.
According to the strips from Ali Express, the initial pH levels of the water were 7.6-7.8
And 50 ml of hydrochloric acid wouldn't do anything, I put a liter and there was still scale on the sides of the spa.
What I do want to point out is that I have had this Hotspring spa for almost 15 years and without a single malfunction!! (There were replacements of filters and things of regular maintenance)
But there wasn't a single glitch! Quality build quality, stable product. You see it's an American product, very satisfied with this purchase.
Yes, my use of chatGPT is excessive, it already chooses for me what to eat for lunch hahahahahahahahahahaha
What do high levels of TA mean? Right now according to my sticks they stand at 80-120 and also the PH in the 7.4 area assuming that these tests are accurate.