Hurricane power outage algae with recurring sediment after shocking repeatedly

[spoxon]

I have an inground pool, 16k gal, SWG, sand filter, solid motorized safety cover. Pool is 4 yrs old, never any algae problems and minimal shocking required since the cover really helps keep the chemistry under control.

My first ever algae outbreak was after a week without power due to Huricane Irene. No trees into the house and no-one hurt in the neighborhood so all in all we got off light.

Traveled on business right afterwards, and discovered algae issue about 6 days ago when I removed the powered safety cover and saw "whitish" haze in water that I assumed was algae.

After 20+ pounds powdered calhypo (switched to na based cl shock so not to raise Calcium, CH now at ~200 per strip) the pool is "clear" in appearance. The FC is 10+ for several days (I know test strips aren't best but I'm waiting on a fas-dpd kit to come from Amazon tommorrow).

Issue is I still see some brownish sediment on the floor of pool each evening, vacumn it up with robot, add 2lbs shock which should put me over the 15 ppm FC shock++ estimates in the forum best guess tables (based on CYA 20-30 per strip measurement). In the morning FC will still be >10 but more "sediment" on bottom. Again, will have the Taylor FAS-DPD FC kit sometime late Sat so I can measure >10 ppm accurately.

My plan was to keep this up morning, evening and late night til finally clear.

FC 10+, CH ~200, pH 7, salt 3200 (SWG), TA 80, CYA 20-30 (hard to read strip)

Summary : Two days shocking to clear water but FC kept reducing quickly, "tons" of sediment vacumed out by robot at that point. Now 3rd day of > 10 FC (IE 5+ days since uncover issue and started shocking 2-3x daily) but still some sediment each morning.

I thought I'd be in the clear by now so I thought I'd post to confirm I'm on the right track.

Scott

[Watermom]

Hi and welcome to the Pool Forum! I think your best bet is to run a full test of numbers when your kit arrives and post them here. Also, do the 'overnight" test to see if you are still fighting algae or if the sediment on the pool may just be dirt. The overnight test is where you test your chlorine level after sundown one evening and then again within two hours of sunrise the next morning. If you have lost more than 1ppm of chlorine, then you know that you are still fighting something. Post your results once you do this

Again, welcome and hope you enjoy being a part of the forum.