You need to be patient and do a Overnight Chlorine Loss Test tomorrow night and maintain your FC at 28 (or above). It is OK to overshoot. The calculations are not perfect because you may not have an exact 25,000 gal pool so there is always some tolerance in the calculations.So let’s say this works and I’m good for tomorrow, how am I suppose maintain my water at the cya/FC ratio of my FC is going to be high for a while?
You have a variable speed pump so you can set more than 2 speeds. That is probably what they did at the beginning but that is an overkill for you need. As indicated by others, since you are running 12 hours a day - set your 12 hours to run at the minimum speed it takes to keep your flow switch on your SWCG operating. Therefore your SWCG will always be producing chlorine for those 12 hours. Now if you want to do some high speed skimming, set your pump to go to a higher speed for lets say, 1 hour in the morning and another hour in the afternoon. The SWCG will still produce chlorine during those times but you will also have better skimming.I only know there are 2 run speeds on the pump high and low. Based on my pool at 25,000 how many hours do I do at high and at low speed at 60%.
Do you have an automation system or are can you program on your pump directly (it would have a touch screen or similar)? Can you provide the model number of your Hayward pump and we can help with new programing.