Brown cloudy water after backwash

pokmo

0
Jul 10, 2018
40
Australia
Hi

For the past 2 days, our pump is pumping out brown cloudy water into the pool after each backwash. However, this lasts about 20 seconds. Does anyone know what might be causing it? I'm not sure if it has to do with the chlorine grains from 2 weeks ago, as we did a shock then. But why would the cloud it pumps out brown? At first I thought it was sand, but there's no sand on the bottom of the pool.

Thanks
 
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