I’ve been doing fresh top off water by dripping it into the tank once a day. I aim for 35ppt and it never goes above 35.6ppt using the drip method. I was wanting to update it with using pressure. This is what I’m talking about. Ive tried it but it’s not working. Everything is air tight. Don’t know if I’m missing something.
DIY: Tea Jar Auto Top-off | Reef Builders | The Reef and Saltwater Aquarium Blog
If you need a great DIY auto top off device, then you might want to look at this clever invention. The auto top off uses a Sun Tea jar, and a air tube that fills the tank automatically.
reefbuilders.com