Do I really need to drain hot tub before adding SWG as directions say????

duganderson

Well-known member
Jan 26, 2021
74
Minneapolis
I just bought a SmarterSpa SWG and the directions say I should drain my tub and refill before adding. Do I really have to drain it? I can't figure out why this would be necessary.

I have a 400 g. hot tub that was drained about a month ago with 2 Ahh-Some purges. I have used the diclor/chorine method AND Nature2 with about CYA at 25. The only additional chemicals I have added are Boric acid to 50 PPM, Acid magic (muriatic acid), dry acid to lower Ph, baking soda once, hydrogen peroxide once (to lower chlorine) and the weekly Ahh-some product (not the purge product). Are any of these products incompatible for SWG?
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
24,849
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Nah, you are good. Just add salt and drop in your SWG.
 
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Newdude

Gold Supporter
TFP Guide
Jun 16, 2019
6,896
NY
They probably state so to better ensure the average tub owner starts with good water. Yours is already WAY ahead of the Jones’s being here. :)
 
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duganderson

Well-known member
Jan 26, 2021
74
Minneapolis
I have my CYA at 25 but am adding a SWG. I've seen posts here and other places that say SWG hot tubs should have a higher CYA but that does not seem correct. Mine is outside but it is covered most of the time except when it's being used or I'm trying to burn off extra FC or CC