You can, and most of us do, use store brand liquid bleach. That, and occasional trichlor tabs, are all I use. I replaced my first liner after the first 8 years my pool was in service, but the rip that started the replacement was well above the waterline, and had nothing to do with my water chemistry. Keep in mind that chlorine is chlorine is chlorine once you get it in the pool, no matter whether it's granulated, tab form, or liquid. The key is in adding the right amounts and keeping your pH where it needs to be.
If you go to a pool store and buy their "pool liquid chlorine", you're getting 12% sodium hypochlorite. Store brand bleach is 5.25 or 6% sodium hypochlorite. I've never been able yet to get a pool store employee to explain to me why the 12% is fine but the 6% will kill my liner?
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