Do I need to drain my pool?

[PoolStored]

I believe, on that filter, the small goes on top...

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[leofeld]

I believe, on that filter, the small goes on top...

Pac Fab Mytilus FMY Cartridge Parts - INYOPools.com

Pac Fab Mytilus FMY Cartridge - INYOpools.com has the largest selection of swimming pool and spa replacement parts with over 70,000 parts in stock. Order today and save!

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Yah they were in the opposite way.
My pool finally started clearing up over the past few days.
I can see now though there a quite a few stains. Can these be removed without draining?

 

[PoolStored]

First, ID the stain...

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