I have algae in my hoses due to them being clear.I have'nt kept the tanks full when stored (lesson learned from the forum).I am now in the process of cleaning the hoses and tanks with bleach solution to remove the algae.Although Im a little bit anxious that I dont flood the van,as I have never done this before.
i just did all mine an a 17, i removed all the clear hoses, used rope with rag tied to it and put a bit of domestos down there and pulled back and forth till clean then rinsed off several times, then removed both tanks, and filled with chlorine soluton, left overnight then rinsed several times (pool has never been so full)
this was done as we just got the van and didnt know state of tanks, what quality of water has been in tanks, and the inside of hoses was a nice shade of dark green!
all clean now and im pondering installing a best filter into the system