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Quick question...I'm fighting off a big green algae bloom in my pool so I'm about to load the pool with a lot of bleach (according to the pool calc anyways) but my question is, does the sand filter effect the chlorine level? Should I add the chlorine then turn off the pump or should I turn the...

I have an older model Hayward S-220T sand filter which had a variflo sp-711 multivalve. I have to replace the valve and it appears that the SP0714T valve replaced the old SP-711 but the in/out ports are offset rather than inline like they are on my current valve. I'm just concerned because it's...