Invisible Slime On Walls

[gadgetman9]

My vinyl liner always seems to have an invisible slightly slippery coating on it. You can't see it, only feel it. If I raise the FC to shock levels, it goes away. As soon as I return to normal FC levels, it returns. I brush it away and it's back the next day. My chemistry is good
FC 4
CC 0
Ch 310
CYA 80
PH 7.5
Copper .3
TA 80

Any ideas?

 

[JamesW]

It's a good indication that the fc is not being maintained sufficiently for your cyanuric acid level.

 

[ThinkPad]

That is probably some sort of invisible algae or an early stage of a bloom. How long has it been that way? As James said, your FC should be at the minimum of 6 per the chlorine/CYA chart.

 

[gadgetman9]

Its been this way for years. I don't want to have to maintain the pool at shock levels. I don't have any problems with algae at all. At least, not visibly. My water is pristine. People often comment on how clean it is.

 

[jblizzle]

Yup. Your FC is too low for maintenance mode and I get the feeling you are not following the ShockLevelAndMAINTAIN Process through to completion by passing the 3 criteria.

Be forewarned that if your copper gets much higher, staining and green hair are in your future. We do not recommend the use of those systems. And the fact that you are still getting algae pretty much indicates that it is not helping you any.

 

[ThinkPad]

Yea, re-read your first post, and if it is going away at shock levels, that is more than likely an algae. What FC level do you maintain during a shock?

 

[pwrstrk]

Are you using liquid chlorine as your chlorine source ?
With your current CYA level your min FC level is 6 and you should be targeting 10.
You may want to consider lowering your CYA level a bit. For a non SWG pool your CYA level should be 30-50 ppm. High CYA level means high SLAM level FC. Yours is 31. ?