How to avoid stock trade settlement violations when scalp trading?

Can somebody please explain how traders avoid stock trade settlement violations while scalp trading?

For example, let’s say that I start the day with $100,000 in my account. During the 1st minute of trading I buy 1000 shares of ABC, Inc. at $100.00 per share. The 2nd minute I successfully sell all of those shares at $100.10 per share. The 3rd minute I then buy 1001 shares of XYZ, Inc. at $100.00 per share. The 4th minute I successfully sell all of those shares at $100.00 per share. I continue to keep up this type of trading all day.

My understanding is that the sale of the XYZ, Inc. shares during the 4th minute would be a good-faith violation if I have a cash account because I sold those shares before they were fully funded.

Therefore, I must use a margin account. But, I read that with a margin account I can only trade up to four times the amount in the account per day. Is that true? If so, then I would have to stop trading for the day after only a few trades.

How do people avoid these limitations while scalp trading?
 
With a 25k+ account as above 4:1 margin intraday 2:1 over night incase you hold, below you can’t buy and sell same day more than 3 times in a 5 day period might be 4 and 2:1 margin.

Sub 25k go Futures, sub 2k go Forex.
 
Thanks to both of you for your replies. I think I understand now, but can somebody please confirm that this is correct:

If I start the day with $25k in a margin account and we assume that stock prices aren’t changing for some odd reason, then I could (in theory) buy $100k worth of stock shares one second, sell all of those shares the next second, buy another $100k worth of shares the 3rd second, sell all those shares the 4th second, and repeat this all day. At the end of the day I would have to ensure that I don’t hold more than $50k worth of shares. I could then repeat this process every subsequent day.

Is this correct?
 
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