How can you say that? Even the slam shock amounts for my spa are 24ppm...that is basically 10 times the usual amount!
Okay, I did a search, found a post by chem geek, and as usual, learned a lot.
The post is here, but I'll try to summarize it. Essentially, there's nothing special about getting rid of CC's.
Any amount of FC will work on breaking down CC's that can be broken down by chlorine. So simply testing, adding, and maintaining your
FC level based on your CYA level will break down and remove CC's.
The 10x rule comes about from trying to figure out how much total chlorine needed to be added to break down CC's. Two issues with this: First, it's based on breaking down ammonia, which isn't CC's, so the ratios are off for typical the typical CC. Secondly, it's how much is
total is needed to break it down. If you constantly test and maintain your FC level, the CC's will get broken down. You don't have to maintain a certain ratio of FC to CC.
I'll add in that some CC's are resistant to breaking down from chlorine. The answer is simple, UV. Just open your spa to the sun for an hour or two.
How can you say that? Even the slam shock amounts for my spa are 24ppm...that is basically 10 times the usual amount!
Not quite. Again, you have to refer to the
chlorine/CYA chart. This isn't something "the industry" has got on board with yet, but it's very well proven here at TFP. A shock/SLAM level of 24 would be for a pool with a CYA of 60 ppm. For the same pool, the
minimum FC level is 5 ppm, and the target is 7-9 ppm. So that's just a factor of 3 higher than normal based on target FC levels, and still only a factor of 5 higher than the minimum FC level. You might have noticed all the values are dependent on CYA level, which is why I keep bugging you to post your CYA level.
If you think those values are crazy, you are new to TFP, so welcome! Please read
this guide on using chlorine in a spa. You'll need a
good test kit to properly maintain your spa, strips are proven to be very inaccurate. If you have other questions, please, feel free to ask! However, do note that to give good, accurate advise for
you, we will need a complete set of current test results (FC, CC, CYA, TA, CH), we'll need to know how you tested it, and how big your spa is. We really do want to help you, but we need you to help us help you, otherwise we are just guessing.
We recommend that you
add a signature, so that your spa size, test kit, and sanitizing method are always visible whenever you post. Be sure to click the "Show your signature" checkbox on the reply page so it shows up.
Perhaps. You certainly need that if you continue to use MPS. As I said before though, there is zero need to use MPS if you don't want to. Chlorine (with perhaps a little help from UV) will do all you need. But you do need to do just a bit of reading to learn how to properly use it, as must industry advise only works for a while as they don't understand the details like we do here at TFP.