Hello,I wonder what you think? I have had 2 Hozelock ecopower + cyprio filters for my pond for years now,they have 3 x 18" x 8" sponges in each one...a coarse one then a medium one and finally a white very fine one,as I am getting older it was getting harder and harder to clean them out,ie buckets of pond water and squeezing each one out till it was clean,anyway I replaced one of the filters with one of them pressurised spinclean ones with the handle that you rotate to clean it,when I had a look inside there was 5 filters but they looked to me to just be coarse and medium,no fine one(they were blue and yellow),I asked the shop where I bought it from about the fine filter and they said that the yellow filter would be fine enough,I did tell them that I had 2 koi as well as the goldfish/carp in my pond, The filter has been in use about 5 weeks now and all seems well (touch wood) so I am thinking of replacing my other filter with a pressurised one while they are on offer,Any thoughts please