How can I tell if chemical cleaning of our sand filter is necessary? It's about 6 years old and has had sand added one time that I know of. No special cleaning chemicals have ever been used. Clean pressure is 19 psi and is partially caused by a "too large" pump, 1.5 inch pipe for a portion of the return line and only two returns.
The Tagelus filter manual list the following products to remove oils, scale and rust: Filter-Cleanse, Filter-Free, Kleen-It. Any specific recommendation among these, or others?
I'm about the remove the multi-port valve to check the sand level and "look" at the sand. What should I "look" for to know if chemical cleaning is required?
Thanks for your advice!