This is a widely debated question. Over the course of the winter, chlorine can be harsh on your pool’s surface, but it effectively kills any bacteria that may linger over the course of the season. Since non-chlorine shock
is available and as effective as chlorine shock
, it comes down to personal preference.
If you do decide to use chlorine shock
before you close your pool, it’s best to do it about a week before you close your pool. If you do it closer to when you’re closing your pool, the chlorine can break down algaecide and other chemicals.
And if you chose to use a non-chlorine shock
, you may want to consider adding an algaecide
while closing to further kill lingering bacteria and work to prevent algae growth. We recommend Rx Clear® 50% Pool Algaecide
; it’s heat activated, remaining dormant until the spring, making it effective closer to when it’s time to open your pool again.
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