Not really. My system usually runs around 20 psi and its still right there. I didn't have a real bad case of algae just enough though where I couldn't get rid of it permanently because I did not shock right. Pool is looking a TONS better. So if I'm orange in the morning go ahead and just run the SWCG like normal and wait for my kit to post full test results? If I'm not orange that means the chlorine was still fighting something and continue to maintain the orange throughout the day again?