Hello, i have a small yard pond about a 100 gallons, i have 2 goldfish
and 3 koi's

i also have a filter box that my pump fits in i have used pond blocks
for algae that treat 250 gallons and the algae keeps growing.
i have cleaned the pond 3 times this year and scrubed it with bleach and
rinsed it good and still it grows. is there anything else i can do.
i thought it wasn't circulating the water enough so i bought a fountain
and put it in and still a big green mess it takes about 3 to 4 weeks and
it is back. thanks