MPS use in Hot Tub

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Andrew Montreal

Well-known member
Nov 4, 2023
75
Montreal
Pool Size
1666
I have moved to the dichlor/liquid chlorine technique. I am still in the dichlor period as it has only been a week.

To note… 1. No one here has experienced discomfort from non-chlorine shock. 2. We do have a UV/ozone purifier system in our Jacuzzi.

Are there any negative effects of using a non-chlorine shock on the weekend? Also… if I keep my chemistry well-balanced, is there really no need for it? Does it not bring any benefits at all?

Thanks.
 
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Andrew Montreal said:
Funny that this is being discussed. I came here to ask about MPS. I have moved to the dichlor/liquid chlorine technique. I am still in the dichlor period as it has only been a week.

To note… 1. No one here has experienced discomfort from non-chlorine shock. 2. We do have a UV/ozone purifier system in our Jacuzzi.

Are there any negative effects of using a non-chlorine shock on the weekend? Also… if I keep my chemistry well-balanced, is there really no need for it? Does it not bring any benefits at all?

Thanks.
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You probably need to start your own thread to avoid confusion with the OP, but generally TFP doesn’t recommend adding anything that you don’t know what it will do.
 
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mps shows up as cc’s when testing unless the taylor interference reagent is used. This can make your actual cc level unknown and cc’s are an important indicator of water health. This makes it a hassle unless truly necessary.
In 5 years of spa ownership I have never had an issue that chlorine didn’t take care of & have never used mps or felt the need. Ymmv but also it is not something I can test for nor is it & its effects listed in
PoolMath so that makes it a no for me.
 
Mdragger88 said:
mps shows up as cc’s when testing unless the taylor interference reagent is used. This can make your actual cc level unknown and cc’s are an important indicator of water health. This makes it a hassle unless truly necessary.
In 5 years of spa ownership I have never had an issue that chlorine didn’t take care of & have never used mps or felt the need. Ymmv but also it is not something I can test for nor is it & its effects listed in
PoolMath so that makes it a no for me.
Click to expand...
I just saw that it is not listed in the Pool Math app. I guess I will stay away from it for now. It’s been one week since I re-purged and changed the water, and I’ve had no issues yet. Seeing as I am following the general guides of this group I will stick to avoiding using the non-chlorine shock. Will simply add a strong dose of dichlor… not even at 20ppm CYA yet.
 
Last edited:
Andrew Montreal said:
I just saw that it is not listed in the Pool Math app. I guess I will stay away from it for now. It’s been one week since I re-purged and changed the water, and I’ve had no issues yet. Seeing as I am following the general guides of this group I will stick to avoiding using the non-chlorine shock. Will simply add a strong dose of dichlor… not even at 20ppm yet.
Click to expand...
Dichlor & liquid chlorine in equivalent amounts are equally as effective. Liquid chlorine doesn’t have the acidic effects that dichlor does so choose the one that properly suits your needs at the time.
If adequate fc is maintained at all times there is usually no need for raising to slam/shock level just because of some arbitrary schedule.
Just feed the tub what it needs when it needs it.
After a soak that may be anywhere between target & slam level fc in order to account for current bather waste + standby chlorine needs until the next use/dose. Whatever the tub needs to remain above minimum for your cya at all times. Testing before & after soaks will help guide you on what your regular fc needs are for the specific way you use the tub each time & help give you an idea of your standby fc consumption.
Of course if you have cc’s above 0.5ppm
you would raise fc to slam level to take care of that. If elevated cc’s remain persistent after a few rounds of slam level fc then that’s an indicator its time to purge, drain, & refill.
 
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The cc’s don’t know whether its Saturday or Monday lol.
Keep enough fc in the tub when it needs it - don’t wait.
If you have a high bather load use more chlorine then.
There’s no need to treat for cc’s you don’t have arbitrarily.
 
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