I have just developed my first roll of 35mm in 20+ years and need some clarification please. In the two photos I have included here there are several white spots and lines, what has caused them? I developed the negs in Ilford LC29 (1+29) for 9 minutes agitating for 30 secs initially then 10 secs every minute - maybe I did not agitate aggressively enough? I used our house water which is straight out of a creek and is laced with minerals so it could well be that. My negative handling has not been as delicate as it perhaps could be, maybe that? The negatives were scanned onto the computer so maybe they had some dust on them?