Pooled Energy monitors water chemistry at the output of the filter continually, every 2 minutes when the filter is running. When the system is not filtering, you may see the pump start occasional and run for a short period. It does this to take a sample of water to check your pool and also to better stir and mix sanitiser around the pool.
In summer, we often set a short filter and pool sweep run about 1 p.m. This is in the shoulder tariff period but this short run skims stirs and chlorinates the water enough to give visible improvement and a worthwhile addition.