Cartucho de prefiltro de ósmosis inversa para desalinización de agua de mar (serie PHF-L)

• Seawater desalination: RO pre-filtration on the intake train.
• Brackish water RO: membrane protection ahead of the skid.
• Industrial water: high flow prefiltration at volume.
• Variable intakes: grade and length selected for seasonal loading.

The job of this stage is not clarity. It is SDI — holding the silt density index low enough that the membranes behind it foul at a predictable rate instead of an expensive one.

On an open intake the load varies with weather, season and tide, so the grade that works in January is not always the grade that works in July. Plants running variable intakes generally specify a coarser grade with more length rather than a fine grade that blinds during an algal bloom. The differential pressure trend across the stage is the number to watch, not the change-out count.

Size on the worst month, not the average. A stage sized on annual mean loading spends part of every year in distress.

Polypropylene is the standard specification on seawater intake and covers most installations. Two cases move it:

• Heavy or highly variable loading — glass fibre, for the additional dirt-holding capacity at the same differential pressure.
• Long continuous hot duty — polyester, for hydrolytic stability that polypropylene does not have over extended service in warm water.

All three carry a 3.44 bar differential pressure rating and cover 0.1 to 100 µm, so the media decision does not constrain the grade decision.

Up to two samples ship worldwide free of charge, with freight paid by the customer.