Use and abuse of a C41-kit

I started with a fresh mixed Tetenal C41 kit (1l).

After using it for some films in the standard 38 deg C/ rotation method,
I decided to try the developing at room temperature
(20 deg C).

Some searching in the web gave me a starting point at 15min with one agitation every 30 sec.
At 18 deg C I developed 30 min with identical agitation and found no difference in the negatives.
Blix time was 30 min, same agitation.

Then I changed to stand development at 20 deg C. First films were developed 60 min with ten initial agitations, then I reduced the developing time to 45 min. Blix time always one hour.

I developed in the kit 33 films so far. Whenever the developer went under 1l, I filled in water to get the litre again.

The scans came out in very different ways. Some pictures could be used without any correction, some had a strong red haze.