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Fix my Pool and Spa
Fix my Pool and Spa, Owner / Technition
Category: Pool and Spa
Satisfied Customers: 1089
Experience:  Over 24 years in pool and spa service and construction
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I have residue on the bottom of y in ground pool,;looks like

Customer Question

I have residue on the bottom of y in ground pool,;looks like black gun powder, itwill not filter out. my. sand filter function dial has "waste" on the dial but that doesn't get ride of the black residue. Any ideas???
JA: I'll do all I can to help. How long have you been dealing with this?
Customer: for weeks,just can't figure out how to go to waste
JA: Do you plan on doing the work yourself?
Customer: yes, just a side I'm 91
JA: Anything else we should know to help you best?
Customer: no thank you
Submitted: 2 months ago.
Category: Pool and Spa
Customer: replied 2 months ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  Fix my Pool and Spa replied 2 months ago.

You have what is called BLACK ALGAE and you need to go to a pool supply center and get an algaecide that kills black algae. The one I have used is called Silvercide, but there are many on the market. Add that to the pool per the instructions on the bottle.