pwrstrk said:If your continuing to SLAM, your FC levels need to come up.
p0las said:Brushpup said:I would do what you are, focus on the FC/SLAM Levels with bleach until all the Algae is completely killed off. If you added 48% Ca Hypo recently that would only be about a 45 PPM increase in CH. Just curious, did you keep the pool going with regular FC levels during the winter months?
yep. the pool was covered with FC above 5 all the time, the pump was running for 4h a day (+SWG).
the water was nice and clear when I uncovered it but there was dead and live algae at the bottom which made the water cloudy once stirred. I did occasionally brush the walls but never the bottom.
yesterday morning OCLT showed only 1ppm but I continued SLAM just to be sure and this morning it showed 5ppm... I guess I will keep going with SLAM for a bit longer.
last night I lowered PH from 7.8 to 7.5 (FC in the evening was 7) and the pool was used during the day. could this contribute to failed OCLT test the following night?
Smykowski said:You should be testing and dosing much, much more often. Preferably every hour or so. At a minimum, 3-4 times per day.
Smykowski said:Let me qualify that above post....
The SLAM process involves elevating FC and holding it high for a prolonged period of time until all three criteria are met, which will clear the pool of all living algae. Simply raising it once will not get the job done. From the pool school article, testing and dosing should be done no more than once per hour, but at least twice per day. The more often you can test and dose, the faster the process will complete. I understand that we have other things going on in our lives, but if its my pool, I would be as aggressive as possible in terms of dosing frequency. As said above, you'll have to guess until you get the reagent refill.