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I like shocking with non chlorinated shock,why double/triple your sanitation levels??I guess it would depend on how much you use. Â As far as waiting that also would depend on how much dichlor you use. The method I use if the water gets nasty, 1/2 cup of non chlorinated shock,wait 30 min running pump on low speed,then 1/4 to 1/2 cup chlorine depending on tub size, run pump again. Add bright n clear run filter pump off and on through out the day if needed.Check PH/ALK.That should clean up any mess if you should have one.Opinions will vary I am sure.
I'm not sure that SpaNE was asking about the worst case scenario that you describe...One varied opinion...
I also prefer shocking with non chlorine shock. Â It is fool proof. Â If you use too much, the residual waits for some thing to oxidize; if you use too little, it oxidizes as much as it can. Â You do not have to wait to use your spa. Â It is a more complete oxidizer. Â The disadvantages are increase in TDS, is more expensive and it does not superchlorinate.If you shock with chlorine, you must add enough to reach breakpoint chlorination. Â If you do not add enough, then you have not shocked. Â Shocking with dichlor adds to CYA. Â It is probably best to wait until your free chlorine level backs down to 5 ppm to use the spa. Â This generally takes about one day, though you certainly could use the spa with 5-10 ppm chlorine if you don't mind it.
I'm not sure what "superchlorinate" means in terms of a disadvantage to shocking with non-chlorine. Â I'm also unsure how to interpret breakpoint chlorination.
OK...so I normally add 1/3 oz dichlor to my 335 gal tub after a nightly soak. Â This generally brings by free chlorine to around 3.If my total chlorine is 5 and my free is 3, my combined must be 2. Â If the rule of thumb is to raise 7-10 times of combined to reach breakpoint - I would need to add about 2 oz of dichlor to shock. Â Correct?I'm assuming that if I add 2 oz it will take at least 2 days before chlorine is back down to 3 again. Â Correct?
I have a 325 gal tub, how much MPS must I add to superchlorinate? Â I tried using MPS before to shock but I can't get the reading up high enough to superchlorinate. Â Then I go back to dichlor to do the job that MPS won't do.And how much dichlor would you use after each soak to keep the 3-5PPM reading?Thanks to all.