Passing OCLT but yellow (algae?) on walls.

[JamesW]

The stains don't hurt anything. They do make it harder to detect algae.

As long as you maintain good chemistry, filtration and other maintenance, you should be fine.

Brush the pool at least several times a week.

Periodically, do an OCLT, to detect issues.

Maintain the fc/cya at a minimum of 7.5%

You can try Jack's #2 copper and scale stuff but be advised that the chlorine will be all CC for weeks.

CC from Jack's #2 (sulfamic acid) isn't particularly bad but you have to be careful about maintaining the chemistry.

Try to maintain the CSI between -0.3 and 0.0.

After treatment, you can use a sequestrant to reduce the amount of restaining.

Also, do not use calcium hypochlorite or granular trichlor.

Ascorbic acid can sometimes work but it can also create new worse stains. So, you can try it if you think it's worth the risk.

 

[duraleigh]

My WAG would be 2000.

If we can't afford it right now, what would be the best practice for maintaining a healthy pool with it's current issues?

Keep the water crystal clear with TFP practices, keep your pH down low (around 7.4) and live with the stains until you can deal with it.

 

[undrwater]

Thank you both. I'll keep the water balanced until we're in a position to do improvements (we really want to update the tile to something more modern). Some plaster is coming off at the steps, so maybe a full re-plaster is called for.

If we're going to fully drain, we might as well get to everything that needs doing.