It's important to test to your CYA degree so you're able to establish what FC targets to employ. If you don’t Possess a SWG, CYA is typically retained concerning 30 and 60ppm. If you have a SWG, CYA is often held amongst 60 and 90ppm (see notes). The contractor has Minimize parts from the shell to restore a crack also to redo the drain plumbing.