How do you remove the black crud from hoses

"Bob K." wrote in message
...
Long plastic hose, was once clear.. Now the inside is
covered with black (I assume) algae crud ..

I've tried running things through to wipe it off, it doesn't
work. Running sand back and forth takes out some,
but it's tedious and doesn't get it all.

You can get the worst of it out by filling the hose about 3/4 full with hot
water, stick a thumb over each end and then slosh the water up & down as
fast as you can. Usinng hot water also makes the hose soft & soft you just
kind of squish it using thumb & finger all the way down its length you will
dislodge a lot of stubborn crud.

Another option is a sall bottle brush with a string attached to it. Attach a
small weight to the other end of the string & feed that through the hose.
With some water in the hose then pull the bottle brush through.

I.