filtration - trying to find permie/renewable solution

Hey,

with my well and rainwater collection, I have a typical 'whole house' filtration system on my not-very-high-psi gravity fed system.  I think at the house I end up with about 22psi.

The filtration system I have is a GE in-line buy-a-new-filter every 3 months, and I definitely need it.  (we then use a Berkey on our drinking water)

Of course I want a washable/permanent solution, rather than have this disposable one.  

I've found some products, but I doubt they fit in the housing I have in place, so I'm probably looking at a whole new one, but I'd like to ask, if anyone has experience:

best product recommendation for a washable/permanent filter that does at least down to 10 microns?  

do you think it would be a BAD idea to do TWO filtration housings?  maybe a 50 micron washable one above a 5 micron replaceable one?

Some more details of the whole system would be good to see.Some initial thoughts;
- If you capture water in large tanks, 20,000L it tends to clean it self a lot.
- Irrigation disc filters come in a range of gap sizes and can be washed clean
- Have you thought of a pressure pump system being in place between a tank and the house plumbing?

How much water do you capture from the roofs now?
And what size is the storage tank now?
regards

We've been using one of these for 6 years with no problems and  zero maintenance. We only use it for drinking and cooking water.

https://www.cawst.org/services/expertise/biosand-filter/more-information

I like the idea of getting two spin-down reusable filters (50micron and 100um or 200um)
https://www.amazon.com/iSpring-WSP-50-WSP-50-Reusable-Sediment-Filter-50/dp/B072YVNRZN

I would then get 2 big blue filter(20inch x 4inch), filled with biochar. And with the 4x20 big filters they will last you quite a while, and when it is done you can add the carbon to your soil.  
https://www.amazon.com/Aquaboon-Pressure-Certified-According-Compatible/dp/B01MG52PQT
https://www.amazon.com/iSpring-FP25B-Universal-Cartridges-Multi-layer/dp/B01LYQ0WWY/

All  disc filters are cleanable, you screw them apart, release a spring and all the discs loosen on the shaft, wash them under a tap or in a bucket and reassemble them.
Very easy
20mm Disc filters

Images of same
variety of disc filters

John C Daley wrote:Some more details of the whole system would be good to see.Some initial thoughts;
- If you capture water in large tanks, 20,000L it tends to clean it self a lot.
- Irrigation disc filters come in a range of gap sizes and can be washed clean
- Have you thought of a pressure pump system being in place between a tank and the house plumbing?

How much water do you capture from the roofs now?
And what size is the storage tank now?
regards

happy to provide details, though I don't actually think they contribute to the in-line filter conversation:

I do capture water in tanks like that (5000g/20kL)
I will try and learn more about 'disc filters'
I have thought about presssurizing, but with my gravity feed, I don't need any power to get water, and thus I like it, even if it's just 23psi
I have different kinds of water catching... I have a car port with a maybe 15m x 15m roof, and my house has 180sm or so. how much I collect depends on the rainfall.
I have 30,000 gallons (120,000L) of tank storage now.