Hi jspec and welcome to the Pool Forum!
100 degree weather and no rain do not cause algae. Low chlorine levels cause algae. Can you please post a compete set of current water testing results taken with a drops-based kit? Make sure that CYA is one of the readings you give us. Also tell us the type of pool and volume and exactly what all you have added to the pool, meaning ingredients and not product names.
Regarding pressure on your filter --- I assume you have been backwashing?
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