What is the best HOCL (as ppm CL2) number to aim for

[smallpooldad]

chem geek,

Thank you for your informative reply.

My question is (I am a little confused) if I just leave it the way it is as there is no algae visibly present and the unit is running at the mid-power setting of 2, which was recommended by the senior tech at Pool Pilot, would that not be the solution? Only issue is it does have to run nearly the full three and half hours to reach 700 ORP.

As you stated raising the cYA seems to me that I would need too much chlorine, which would require running the pool pump for a long period.

But the number I gave 5.5 FC appears to be ok from a health and swimming point of view, or is that not correct?.

I'm not sure where the yellow stuff comes from but where we live at a 1000 ft the trade winds roll over the mountain daily at about 16 mph to 26 mph on average blowing fine stuff (particles) constantly into the pool. So while we may cure it temporarily in all probabilty it will return just as fast. Therefore my feeling is to leave it as is, or do you think this is not wise? I will certainly give the phosphate suggestion a go and let you know if that has any effect I could become the pool stores only Diamond Card client if it does at least until I have to eat and stop buying phosphate remover.

The pool is pretty much 4 ft 6 in deep all the way round with steps into it, that is why I thought the UV may play a roll.

Finally what do you think is KWH use is of the SWG. I noticed in another thread on cost of chlorine nobody seemed to factor this in, or I could be mistaken.

As always thank you once again for all your great help. In this case I think I am between a rock and a hard stone.