Personally, I think that looks a little weak but the pump is definitely working. It could be an airlock that's causing a depleted flow....

Water pumps are cheap, and an easy replace, so might be worth replacing it.

"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10