Non-Chlorine Spa Shock for Hot tub - Chlorine Free Hot Tub Shock Treatment & Enhanced Shock to Assist Bromine & Chlorine Shock - Suitable Chlorine Free Shock Oxidizer - Aquadoc - 5lbs

This product works as advertised and has been EXTREMELY effective in keeping our water clear. Complaints about the lid on the container are real. It is extremely difficult to open and I don't see any reason for such a complex lid design...the company must have gotten sold on this design from a family member or someone they owed a favor because no sane person would think its easy to open or use. But it's worth the headache for how the treatment works!!

Good shock and doesn’t smell like traditional chlorine! My skin is better and not as drying as some shock. I would recommend for the size you receive and affordability!

Been using for over a year, works well. I use the recommended amount normally but after a load of grandkids I'd recommend a bit extra.

TL;Dr for lid problems: Smash the side of the lid with a hammer all the way around to loosen it. The product is a good value, the first one I bought I definitely struggled with the lid but mainly because I couldn't reasonably get the red tab high enough. The second one I was more prepared but despite knowing exactly what to do the lid wouldn't budge. For anyone who says they never had a problem with the lid: you got lucky however many times in a row. The red tab was out of the way but the lid does not budge whatsoever. And I'm the person my partner goes to for opening difficult things. I tried a bunch of stuff without outright destroying the container but what eventually worked was blunt force trauma all the way around the lid. I originally had a wrench to clamp open the red tab, so I took it and smacked the side of the lid all the way around in frustration. After one more good tug, it finally gave. Just in time to do my weekly chemicals tomorrow!

Cheaper option than what I was buying. Works great no issues yet!