This says we should use chlorine to fight the algae, but we don't use chlorine in our pool; we use EZ Pool and we aren't going to switch. This is our 3rd summer with our pool and have NEVER had the pool this difficult to get clear. We've had it open for over a month and it has been disgusting from day one. We've used lots of Shock, Drop out, Clarifier, PH UP and Alka Up plus our EZ Pool chemicals. Would some sort of algaecide work??