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

[smallpooldad]

Yes what chem geek described in the last post was exactly what I was trying to acheive.

The reason being that even though it is recommended that the Pool Pilot Total Digital SC-60 be mainted at 3 ppm measured chlorine I have found that to be too low as small spots of yellow algae start to form.

If I up the ORP to 700 it maintains around 5.5 FC at a pH of 7.4 and Alk at 70 (to reduce acid usage), calcium is about 580, borax 50, and cYA 35, salt 3000. This gives a calculated HOCL of about 0.075. 10,000 gals and pump runs 3.5 hours per day, from noon to 3:30 pm at 55 GPH (too reduce energy cost) as KWH is $0.27 in Hawaii and going up steadily.

This gives a algae free pool it might be that being at a lower altitude algae develops faster as the UV index is stronger.

It seems that having a bigger unit such as the SC-60 allows for stronger chlorine production and thereby allows lower run times, in Hawaii that is. It might be that different parts of the country can get away with less powerful units. I would be interested in any comments.

So far I have been very happy with the Pool Pilot Total Digital performance 10 out of 10, manual is not that clear or well written but adequate with calls to tech support 5 out 10, tech support is weak at level one they seem to be robotically answering questions and quickly become frustrated if one gets at all technical. At higher levels it gets better and if you drive them crazy enough you will finally reach the top level support which is excellent albeit that it can take you a frustrating 30 minutes of back and forward "that is not what I am saying and I need to know", 3 out of 10 at lower levels and 9 out of 10 at the top level ( one mark off for sounding a bit irritated that they had to answer the call).