SLAM - FC Consumption...OK?

[Blitz357]

Between the hurricane thru Texas and fighting these stupid grub like worms that keep crawling out of my landscape into my pool I noticed some green and some dark spots in the pool that don't come off with a typical brush session. Clearly bad things are a foot. I grab my TF-Pro test kit and 0 FC. I gave the pool a good cleaning, backwash, etc, and started SLAM. This is my first slam session, pool is 1 year old and never any out breaks till now (my fault). If something seems off with any thing here let me know. My biggest question is about how much it seems to be consuming. I am gonna have to dip into the kids college fund if it doesn't slow down.

Specs:
Pool: 25k-27k gallons, in ground, gunite
Start FC: 0
SLAM FC: 14 (is this right?)
CYA: 35
Chlorine Type: 10% liquid

Initial: Pool math said 14 FC for SLAM and that meant 3.5 gallons of 10% chlorine to start. I did all this right at dark, so 8:30-9pm on 7/11.

Next readings/additions:
7/12 7:30am - FC 10, I added 1 gallon
7/12 11:30am - FC 10, I added 1 gallon
7/12 4:30pm - FC 7.5, I added 1.5 gallon

So that is where I am so far, but holy smokes am I really burning up a gallon plus every 4 hours? Is something wrong with my testing? For the record, I am just running the FAS/DPD instructions from the TF-Pro for FC.

Thoughts? And thanks, what a great community!

 

[mknauss]

Welcome to the forum!
I would round up your CYA to 40 ppm in Poolmath. FC SLAM level at 16 ppm.
It will take some chlorine. Should slow some over time. You will have greater daytime losses with low CYA, but you need that for the SLAM.
I suggest you read through Pool Care Basics - Trouble Free Pool and even look at a few of our videos TFP-TV - Trouble Free Pool

 

[Rancho Cost-a-Lotta]

Welcome to TFP!

Marty responded while I was typing, so I'll just stop by and say hi. Sounds like you've done your homework. Stay on top of testing and maintain FC at SLAM level. Clean filter when pressure increases 25% over clean pressure. Brush at least once a day.

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www.troublefreepool.com

Best wishes!

 

[Blitz357]

Thanks for the input and encouragement. Ok, if nothing seems a miss, then I will bump up the CYA in poolmath and ultimately bump my FC up a little bit and continue feeding the beast with $4 a gallon liquid gold and pray it gives up soon. ...and yes lesson learned from getting lackadaisical about testing. Thought I had a decent rhythm of adding going. Never having an issue had me thinking I am bullet proof. I am not.

 

[Rancho Cost-a-Lotta]

Once you complete the SLAM, consider a SWCG to eliminate the need to add chlorine each day. You'd need one rated for 60K gallons. The CircuPool RJ-60 Plus would be a good choice.