Hurricane power outage algae with recurring sediment after shocking repeatedly

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