DEAR MR ALI: Please take in ...

DEAR MR ALI:

Please take in big consideration the response from Mr Voutchkov.

All he says is 100%  true.

UF is not a good pre treatment for RO in the most of the cases, producing a high fouling in the RO membranes and a big chemicals and water consumption in the UF section.

The gurus of modernity are wrong when depreciate sand filtration because is an "old system".

I do not know any Plant fitted with UF that is working OK.

All of them have big troubles and also a big consumption of cartridge filters (Normally 4 or 6 times higher than the ones in sand filters Plants)

Ask to the UF makers why their warranty is SDI 2,5 or 3 and not 0,5

Water filtered through a 0,003 microns should not deposit any matter on the Millipore SDI of 0,45 microns, but you get normally SDIs from 1,5 to 3.

The best pre treatment is a double stage sand filtration, with a first stage of anthracite and sand and a second one with sand and garnet.

In your case, I should keep the UF and should install the sand filtration as pre treatment of the UF.

Perhaps in this case, a single stage of dual media filtration should be enough.

A pilot will give you the answer

Regards