New spa questions

Jay397

Member
Mar 22, 2020
5
Los angeles
Just got a new bullfrog a7 hot tub last week and I read alot of info and followed the thread on how to chlorinate a spa. I got the alkalinity down to 80s and the ph to 7.5. My cya levels are still in the 10-20 range. I am keeping my FC between 3-6 and plan on switching to bleach when I need too. I plan on bringing the alkalinity down a little more tomorrow but I have some questions.

Why does the composition of the spa matter? Is mine considered equivalent to fiberglass or vinyl?

Can someone explain why the target TA of a pool is different from a spa?

I have a non chlorine shock called renew from leisuretime. How often and how much do I use? My spa is 434 gallons and the instructions say use 5 tablets but will this throw off my alkalinity and ph? And do I use this everytime I use the spa or only use it once a week? Do i dose it with chlorine or seperately?

Due to covid and people buying all the bleach in stores is there an alternative I can use? I went to multiple stores today and all bleach has been cleared out.

Lastly, right now I am home all day and can test and adjust daily but what happens later down the line when I want to take a 7-10 day vacation? How do I maintain the chlorine levels while I am away? Or do i let it dissipate and start over when I get back?
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jay, welcome to TFP! :wave: Lots of good questions. I'll try to help get your thread moving and I'm sure other spa/tub owners will reply.
1 - So remember, there are distinct differences between a spa (i.e. plaster attached to a pool) and a hot tub (acrylic/fiberglass type). That's why you may see some different recommended levels. Spa's with plaster much be careful about aggressive water (low TA/pH/CH) that can erode the plaster. Not normally an issue for hot tubs. Also, in tubs there is a volatile change in water chemistry due to the elevated water temp and aeration. That is another reason you may see a lower TA recommended as it helps to compensate for other items like a rising pH.
2 - Look at the ingredients for that Leisure-Time shock. It's probably an MPS-type product or cal-hypo (CH).
3 - Other than liquid chlorine/bleach, you may be stuck with some other pool store-type chlorine product. Just be aware that it may influence your CC and/or CH levels.
4 - Pools/spa owners who are away for several days may have a salt water generator that keeps the FC going. For us non-salt owners who dump chlorine manually, we either use a tab floater (which will increase CYA) or ask a friend to add a little chlorine each day.
5 - One last thought - did you do an Ahh-Some treatment yet? Even new tubs should have one done. If not, look it up or the link below. Very important.

If you found our spa/hot tub sticky and are following those notes, you should be fine. Hope that helps.



 

Jay397

Member
Mar 22, 2020
5
Los angeles
Thank you for the info.

To further clarify the renew tabs are Potassium Peroxymonosulfate.

And yes I ordered some ahhsome already. It is on it's way. After filling the tub, chlorinating, and heating to temp I felt a scum line all around the tub before even going in the first time. I am assuming this is biofilm that was in the tub from the factory so I ordered some ahhsome.
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
To further clarify the renew tabs are Potassium Peroxymonosulfate.
So that is an MPS-type prodict. Here are a couple threads on that:


You'll be thrilled to get that Ahh-Some and see the results.