Red algae in a swimming pool can be dangerous to humans. The algae can release toxins that can cause skin irritation and redness, nausea, vomiting, and dizziness. To prevent red algae from growing in your pool in the first place, make sure to keep the pH balanced and use an algaecide on a regular basis. If you’re in Santa Rosa and you’ve discovered a bad case of red algae in your pool, contact poolchemservice.com to schedule your appointment and they will take care of those nasty algae blooms in no time.