I use to owned this GF4K, initially the first 6mth was good, but after 6mth nightmare start...I must say not the best & I won't recommend,
1st time happened, the motor died, they replace me a new set, 1 for 1 exchange,
then power adapter burn smoke come out, they replace new one....
then, had to get the O'ring replace many times for the impeller, it keep on breaking, the worst part after 1 year use, one side was working normal & the other side move slow, had it repaired few times, but sill the same...
in the end, I decided to use my old jebao wm which is much more reliable, maxspect design is sleek very cool looking , not cheap for wave maker/ crossflow, imo. not everything from maxspect are good..