I have 400gph going through it with 5/8 tubing. I'll change it to 3/4" tubing and get a bigger pump. I was impressed with it at RAP, since they said rated upto 500g, but my old JBJ 1/3 I think did a better job. On the specs it says TECO has 2620 BTU, but the 1/4 JBJ is 3000 BTU and the 1/3 JBJ...