Let me start by telling you one very important thing: Never, ever, ever make your pasta water as salty as the sea. That is the worst advice anyone can give. It is repulsively, inedibly salty. Frankly, 3% salt is also way too salty.
Sorry, but you are not adding seawater level salty water to your pasta. You might think you are, but you definitely are not. The water should be very salty, but seawater is very very very salty.
https://www.seriouseats.com/how-salty-should-pasta-water-be
Sorry, but you are not adding seawater level salty water to your pasta. You might think you are, but you definitely are not. The water should be very salty, but seawater is very very very salty.