Do I really need to buy?

[gobytron]

Originally Posted by Aquattro

So assuming this is true, let's say the difference is negligible, then doing 30 times more work results in negligible change. Right?
Heating water is nothing, parameters should be stable already or you have other issues, and proper design and planning make any size change easy. My 50g water change takes about 3 minutes of actual hands on time, and another 10 to set up and add salt. Let's call it 15 min twice a month. Versus how much effort to do 8 or more water changes a month? For no difference.

It's not 30 times more work.

You keep a large bucket of mixed salt and a pitcher.

Every couple days, scoop a pitcher out of your tank, then replace it with a pitcher from your mixed barrel...

Easy peezy...

You should also the consider the cost, space taken and time taken to build your 3 minute 50 gallon system.

It's not for everyone...even if it's a superior option.