Filter recommendation

[Trosk]

Hello, sometimes I see something floating in the water, which I think is dead biofilm. I'd like you to recommend a filter for very fine particles, because in the filters I have—one gravel filter and one basket filter with a pre-pump—this biofilm passes through and returns to the water. When this biofilm isn't present, the pool is clean, as the water is clear all the way to the bottom, which is about 2 meters deep, so the gravel biological filter is working well. Would a typical pool sand filter work in this case, or would it get clogged?. Thank you.

 

[GBBUDD]

Pool sand filter will clog in an hour or so will it do what you want yup but your going to live at the side of the filter. One thing will do what you looking for is a cetus sieve filter
https://playitkoi.com/products/cetu...oScggTJM4QnBi_eALQHni_u0D0DizYExoCrj4QAvD_BwE

Another option in an oase

https://playitkoi.com/products/oase-biotec-screenmatic-rotary?variant=28797524705314&cmp_id=20773556085&adg_id=&kwd=&device=m&tw_source=google&tw_adid=&tw_campaign=20773556085&tw_kwdid=&gad_source=1&gad_campaignid=20783823313&gbraid=0AAAAADSOA0LmwtZ2cKWZ-S6Eyu7J-oAr-&gclid=CjwKCAjwpqHTBhAcEiwAj2Afuno55CDMd1S1UgXalzvt6ZilOIqNn2LlJEVP9Q4AEWIsa4FRQRGHFxoCF18QAvD_BwE

But this will require attention the amount of algae you have will need attention.

My opinion is 2 sieves they max oit around 4000 gph.

 

[Ronfire]

I had problems with string algae clogging my skimmer and primer pot in 2 day. I installed an Ultra Sieve 3 about 2 weeks ago. I works great screening out the particles to 300 microns. Now my pump always pumps the max flow rate without getting bogged down, I removed the screen in my skimmer and the primer pot. It is supposed to handle 7900gph with 2- 4" inlets. It is gravity fed so has to be installed with the top just above the pond level. Wish I had done this years ago, well worth the money.

 

[Trosk]

Perfect, thanks for the answers.

 

[Ronfire]

I liked the workings of the Ultra sieve better than the Cetus sieve it also can handle more than twice the flow rate. I feed mine with 2-3" lines.

 

[GBBUDD]

I liked the workings of the Ultra sieve better than the Cetus sieve it also can handle more than twice the flow rate. I feed mine with 2-3" lines.

Im designing a diy sieve verssion for my cistern i currently just use a green matala mat. The issue is theres no easy way to hook up a waste line. So i am leaning toward no automatic waste removal. I already remove waste from tbe matala mat si it might just become a bit more often. Its going to basically just be sheet of micron above the matala mat and if i am late the unit will simply over flow.
Every bit of filtration without additional energy cost is a win win. Ill post pictures when i make it. That will be the hard part as i will want to hide it.

 

[zainwahid]

From what you're describing, it doesn't sound like your biological filter is the issue since the water is otherwise crystal clear. The floating bits are more of a mechanical filtration problem, and fine biofilm can be surprisingly difficult to trap.
A standard pool sand filter will catch finer particles than most gravel or basket filters, but on its own it may still let some of that biofilm through unless it's running with very fine filter media or a small amount of filter aid. The downside is that if there's a lot of debris, it will need backwashing more often rather than completely clogging.
Before adding another filter, I'd also check whether the biofilm is being broken loose somewhere in the system. Sometimes cleaning the plumbing, waterfall, or biofilter too aggressively releases a lot of fine organic material for a day or two.
If it were my pond, I'd first try adding a dedicated fine mechanical stage after the pump—something like filter pads or a polishing filter—before investing in a sand filter. It's usually cheaper, easier to maintain, and specifically designed to catch the tiny suspended particles that biological filters don't remove well.
If the biofilm is only appearing occasionally, finding out what's causing those releases may solve the problem better than simply adding more filtration.

 

[Ronfire]

I find it best to screen before the pump if you can. The pump will chop the debris into smaller particles making it harder to remove.. The nice thing about the sieve it that it slides the debris down the screen and allows the water to through. With my sieve I do not use the clean out drain, I simply reach in and grab the debris and throw it in a bucket. With my plumbing layout the outflow from the pump is in the way, that is the problem with retrofitting filters and not wanting to ad more elbow and reducing the flow rate.