If your pool is clear and you keep your chlorine above minimum and below shock level for your CYA of 30 and your PH is between 7.2 and 7.8 then you can swim.
The Chlorine CYA Chart shows that for CYA of 30 the minimum chlorine level is 2, target is 4 and shock is 12. So you should try to keep your chlorine level at 4 or 5 at all times. But, you can swim up to 12. Use Pool School - PoolMath to calculate how much liquid chlorine to add.
Yes, it is possible to have algae and not see it. That is the first stage, filter clogs fast and high chlorine consumption. 2nd stage cloudy water and slimy pool walls. Third stage green pool.
So, to get rid of the algae bloom you need to Pool School - SLAM - Shock Level And Maintain the pool.
The Chlorine CYA Chart shows that for CYA of 30 the minimum chlorine level is 2, target is 4 and shock is 12. So you should try to keep your chlorine level at 4 or 5 at all times. But, you can swim up to 12. Use Pool School - PoolMath to calculate how much liquid chlorine to add.
Yes, it is possible to have algae and not see it. That is the first stage, filter clogs fast and high chlorine consumption. 2nd stage cloudy water and slimy pool walls. Third stage green pool.
So, to get rid of the algae bloom you need to Pool School - SLAM - Shock Level And Maintain the pool.