This tool will help you determine if you have enough contact time for your chlorine-based sanitizers to be
It is recommended that you remove organic matter with a filter (rapid sand or disc),
and then add your sanitizing agent.
Fertilizer should only be added after at least 2 minutes of sanitizer contact time, since it interacts
with sanitizing agents.
Contact Time (min)
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Total Contact Time
Two minutes minimum is recommended for all types of chlorine
The contact time is more than two minutes. No mixing tank is needed.
The contact time is less than two minutes. Consider adding a mixing tank to increase contact time