New Hot Tub Rash

mmlco

Member
Aug 28, 2021
9
Thornton, CO
Pool Size
432
Surface
Fiberglass
Chlorine
Liquid Chlorine
Moved from here.
New Bullfrog hot tub owner. We've had the hot tub just over 2 weeks. It came with the @Ease SmartChlor system. Husband followed the startup procedures, initial jump start dichlor, tested ph and added ph increase. Did a shock treatment.

ph has been 7.5 tested water at a work lab.

I had a small rash reaction after a few days. Hadn't used in a few days and now in the second week, I'm getting more of a rash.

Is there something I can do in the meantime while I figure out
 
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YippeeSkippy

Mod Squad
Gold Supporter
LifeTime Supporter
Jan 17, 2012
17,612
Evans, Georgia
Hi there MMico :) Welcome to TFP-

Are you testing in any way the FC before you get in, and later after soaking adding any chlorine? You might have the SmartChlor set too low.

Do not hang around in a wet bathing suit. As you have probably experienced the rash is worse where the bathing suit is against the skin. Take it off after soaking and shower since you are having these problems.

What is it that you do that you're calling a "Shock Treatment"? I've never once had to raise my pH with anything- running the jets usually takes care of things and in fact at times I have needed to lower the pH.

Maddie :flower:
 
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mmlco

Member
Aug 28, 2021
9
Thornton, CO
Pool Size
432
Surface
Fiberglass
Chlorine
Liquid Chlorine
I'm playing catch-up on the spa. My husband was handling the testing and adjustments. Now I get the rash and he wants me to handle it. We haven't tested for FC yet. I just tested with the test strips:
TA 80ppm
ph 7.2
Total Hardness 150ppm

SpaShock is potassium peroxymonosulfate, a non-chlorine treatment to oxidize and rid the spa of non-filterable contaminants.
 

Mdragger88

Bronze Supporter
Jun 1, 2018
3,135
Hernando, Ms
Pool Size
26000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Intex Krystal Clear
Mps can really irritate some people- be aware it’s only an oxidizer & not a sanitizer.
It can also show up as cc’s when testing which makes accurate testing complicated without a special regeant.
Chlorine is both an oxidizer & sanitizer.
You want to follow the FC/CYA Chart to ensure your tub is sanitary.
& here’s a handy guide 👇
 

Oly

Gold Supporter
Jun 28, 2017
2,339
Fresno, CA
Pool Size
27000
There are several possible reasons a hot tub can cause a skin rash.
That said, it is always a best practice to clean and purge the plumbing on any spa before using it.
Invest in the proper tools to keep your spa sanitized then deep clean and drain your spa.
Research the TFP process and start fresh.
 
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JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
18,586
Tucson, AZ
Pool Size
16000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
That @ease SmartChlor is anything but “smart” … it’s essentially the same chemical as a toilet bowl sanitizing tablet. It will not register properly on a test kit as it will read false high combined chlorine and very low free chlorine. It’s really not worth it as it’s a typical overpriced spa chemical. Read the stickies above and follow the hot tub purge method as well as the dichlor/bleach method. You should be doing all of your own testing at home, not at your husbands work lab. You’ll never get good accurate chemical readings that way (a bottle of test water that sits around all day waiting for a lunch break to do tests is not an accurate representation of your tub water).
 

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mmlco

Member
Aug 28, 2021
9
Thornton, CO
Pool Size
432
Surface
Fiberglass
Chlorine
Liquid Chlorine
That @ease SmartChlor is anything but “smart” … it’s essentially the same chemical as a toilet bowl sanitizing tablet. It will not register properly on a test kit as it will read false high combined chlorine and very low free chlorine. It’s really not worth it as it’s a typical overpriced spa chemical. Read the stickies above and follow the hot tub purge method as well as the dichlor/bleach method. You should be doing all of your own testing at home, not at your husbands work lab. You’ll never get good accurate chemical readings that way (a bottle of test water that sits around all day waiting for a lunch break to do tests is not an accurate representation of your tub water).
Thank you JoyFul
 
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mmlco

Member
Aug 28, 2021
9
Thornton, CO
Pool Size
432
Surface
Fiberglass
Chlorine
Liquid Chlorine
There are several possible reasons a hot tub can cause a skin rash.
That said, it is always a best practice to clean and purge the plumbing on any spa before using it.
Invest in the proper tools to keep your spa sanitized then deep clean and drain your spa.
Research the TFP process and start fresh.
Thank you Oly.
 
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mmlco

Member
Aug 28, 2021
9
Thornton, CO
Pool Size
432
Surface
Fiberglass
Chlorine
Liquid Chlorine
Mps can really irritate some people- be aware it’s only an oxidizer & not a sanitizer.
It can also show up as cc’s when testing which makes accurate testing complicated without a special regeant.
Chlorine is both an oxidizer & sanitizer.
You want to follow the FC/CYA Chart to ensure your tub is sanitary.
& here’s a handy guide 👇
Thank you Mdragger
 
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YippeeSkippy

Mod Squad
Gold Supporter
LifeTime Supporter
Jan 17, 2012
17,612
Evans, Georgia
I misunderstood thinking this SmartClor was a spa sized salt water chlorinator. I have one (i believe it is by Saftron) and it instills chlorine so ;there should never be a time that there is zero chlorine in the spa.
You might want to look in to it.

Maddie :flower:
 

Mdragger88

Bronze Supporter
Jun 1, 2018
3,135
Hernando, Ms
Pool Size
26000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Intex Krystal Clear
@mmlco
Here’s the guide to get u going after u purge & start fresh 👇
It’s also 📌 pinned @ the top of this forum.
 

BravoRomeo

LifeTime Supporter
Jun 15, 2012
91
San Juan Islands, WA
Fellow Bullfrog Spa owner here... having been down the SmartChlor road myself, my advice is remove the SmartChlor system and start over with an Ahh-some Flush, a TF-100 test kit, and new water (your time is worth more than the $2 or $3 it costs in water to fill your tub). Follow the Chlorine Spa instructions on this forum, and get a handle on the basics. It's easier to manually dose your tub and the results are far, far better... like sparkling clean water for a good three months of daily soaks with less plastic waste and more money in your wallet.

Once you've got a handle on manually dosing your spa, you'll likely never want to try SmartChlor again. I tried making those cartridges work for two seasons, but it was more trouble than it's worth, and after all this is Trouble Free Pool, not More Trouble Pool! ;)

Hot tub rash can be caused by bacteria, pH imbalance, sensitivity to high pressure massage jets, or soaking too long in too hot of water. I understand that a rash caused by bacteria usually takes several hours to manifest, where as the other causes are much more immediate.
 
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phonedave

Well-known member
May 30, 2012
1,016
Montville NJ
Pool Size
17000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Hayward Turbo Cell (T-CELL-5)
I am in the process of using up my last @Ease cartage. They gave me a case when they delivered my spa so I used them.

What I did not use is MPS, or "Non-Chlorine Shock" The spa guy gave me a canister and said "Add a capful after every time you use the spa". MPS allergy is quite common, and I figured that there was no sense in using it. I add liquid chlorine after ever soak. I'm due for a water change soon, and when I do I am going to get rid of the @Ease.

I would go with MPS as the cause of your rash for now - stop using it and see if the rash abates

 
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mmlco

Member
Aug 28, 2021
9
Thornton, CO
Pool Size
432
Surface
Fiberglass
Chlorine
Liquid Chlorine
Fellow Bullfrog Spa owner here... having been down the SmartChlor road myself, my advice is remove the SmartChlor system and start over with an Ahh-some Flush, a TF-100 test kit, and new water (your time is worth more than the $2 or $3 it costs in water to fill your tub). Follow the Chlorine Spa instructions on this forum, and get a handle on the basics. It's easier to manually dose your tub and the results are far, far better... like sparkling clean water for a good three months of daily soaks with less plastic waste and more money in your wallet.

Once you've got a handle on manually dosing your spa, you'll likely never want to try SmartChlor again. I tried making those cartridges work for two seasons, but it was more trouble than it's worth, and after all this is Trouble Free Pool, not More Trouble Pool! ;)

Hot tub rash can be caused by bacteria, pH imbalance, sensitivity to high pressure massage jets, or soaking too long in too hot of water. I understand that a rash caused by bacteria usually takes several hours to manifest, where as the other causes are much more immediate.
Hello BravoRomeo.

I agree with your suggestions. Ahhsome flush either tomorrow or Saturday, I've been getting up to speed on the various TF-100 tests. I have the liquid chlorine and baking soda on hand. Still need to get the dry muratic acid (for TA
Fellow Bullfrog Spa owner here... having been down the SmartChlor road myself, my advice is remove the SmartChlor system and start over with an Ahh-some Flush, a TF-100 test kit, and new water (your time is worth more than the $2 or $3 it costs in water to fill your tub). Follow the Chlorine Spa instructions on this forum, and get a handle on the basics. It's easier to manually dose your tub and the results are far, far better... like sparkling clean water for a good three months of daily soaks with less plastic waste and more money in your wallet.

Once you've got a handle on manually dosing your spa, you'll likely never want to try SmartChlor again. I tried making those cartridges work for two seasons, but it was more trouble than it's worth, and after all this is Trouble Free Pool, not More Trouble Pool! ;)

Hot tub rash can be caused by bacteria, pH imbalance, sensitivity to high pressure massage jets, or soaking too long in too hot of water. I understand that a rash caused by bacteria usually takes several hours to manifest, where as the other causes are much more immediate.
Regarding the flush on a Bullfrog spa, is it difficult to wipe the jetpacks/it's components? Should I put the filters in the middle? The tub is barely 3 weeks old.

I've put the kabosh on the MPS. Thank you for the link.

Testing yesterday;
CH = 300ppm
CYA = no reading, possibly user error
FAS/DPD FC = .5 and CC = 1.5; TC = 2, added liquid chlorine
TA = 60ppm, added baking soda
pH = 7.5, pretty steady since initial fill

I limited hot tub time/use since posting on Aug. 30th. After adding chems yesterday, soaked for 45 minutes last night and no noticeable irritation!

Sorry, I thought I added my profile/signature information.
Bullfrog R7L - 432 gallons -
 

mmlco

Member
Aug 28, 2021
9
Thornton, CO
Pool Size
432
Surface
Fiberglass
Chlorine
Liquid Chlorine
I am in the process of using up my last @Ease cartage. They gave me a case when they delivered my spa so I used them.

What I did not use is MPS, or "Non-Chlorine Shock" The spa guy gave me a canister and said "Add a capful after every time you use the spa". MPS allergy is quite common, and I figured that there was no sense in using it. I add liquid chlorine after ever soak. I'm due for a water change soon, and when I do I am going to get rid of the @Ease.

I would go with MPS as the cause of your rash for now - stop using it and see if the rash abates

Thank you phonedave. I've stopped the MPS and actually, thank you for that link. When you add the liquid chlorine after the soak, is it generally the same amount/quantity?
 

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