Tagelus Sand filter ID

[catoars]

Hi y'all, I am finally getting around to replacing the sand in my filter, however I realized that I have no idea how much sand to put in as I don't know which model I have. The filter itself bakes directly in the central Texas afternoon sun so virtually all words/numbers on it are too faded to be read.
Anyone have any idea how I can figure out which model I have or any other trick to determine how much sand to put in this?

 

[Texas Splash]

Various ways to do that. You can measure the vertical height and circumference of the filter and we can look it up that way. Sometimes you might see a line inside the wall about 2/3 way up near the top to indicate the sand fill line. If no line, then the same basic rule applies to fill it up about 2/3, while the sand remains a couple inches below the top of center pipe so it doesn't get in there.