I'm converting another friend to the TFPC method. They went away a few weeks ago, and while away, their pump broke. They came home to a mess. The pool store has been trying to "help" to the tune of hundreds of dollars of chemicals, with little to no progress. At one point they had it back to a shady/cloudy greenish blue, but never clear. My guess is chlorine wasn't high enough for long enough (SLAM process) and the algae took over again. Well, my wife offered my services. Kind of getting to be known as a Pool Whisperer around town. Fine with me. I enjoy it and enjoy helping people that appreciate it and are willing to learn.
Anyway, I thought I'd start a thread to keep track of the progress and in case I have questions. I actually do have one, about how to do the spa and pool at the same time, but I'll get to that.
First, here's the pool on Day 1, yesterday, 9/7/15 at about 3pm.
This is a lagoon style pool with spa. Spa doesn't spill over except for overflow. I'm estimating the pool size at 28,000 gallons. It's gunite. about 40 feet long and averaging 15-17 feet wide. 7 foot deep end, 3 foot shallow end. Spa is around 400 gallons.
Readings that mattered yesterday:
FC: 0 (I stopped there)
pH: 9+ (YIKES!)
CYA: 0 (thank goodness)
They had 5 gallon jugs of chlorine from pool store, but I couldn't figure out concentration. I assumed about 12%, but it must have been more. I put in 5 gallons, and 3 hrs later, FC was at 25! I checked again this morning, and it was down to about 19. No sunlight, so obviously we are killing junk in the pool. Nice! I have checked the charts and SLAM should be 10, so I'm going to hold it at at least 12...I will check again tonight around 5pm,. maybe a bit later. And given the high pH, before I treated with chlorine (since I know you can't test pH with pH over 10), I added muriatic acid yesterday to bring pH back down to around 7.4 before I added the chlorine (did it about 1 hr before I added chlorine). They've bought about 10 gallons of bleach so far, and will buy more today.
They are brushing religiously which is great, and have spare cartridges for their filter, so the frequent cleaning of the filter only results in a few minutes of downtime as they swaps filters. Pump for filter is set to maintenance mode so it's runs 24x7 while we fix this.
Here's the question on the spa. The pool and spa share the same filter/pump. There are valves controlling which gets filtered. So when spa is filtering (program is 1 hr per day), the pool is not. When the pool is filtering, the spa is not. The spa, if you drain it, drains into the pool. So I can't run the spa and the pool 24x7 at the same time. I certainly don't want to get the pool clean, and then drain the spa into the pool and put that algae in there. So should I just empty the spa, and refill (only 400 gallons), or just slam it as normal, only running filter about 1 hr per day and stirring it up manually once and a while? Thoughts are appreciated.