Hydranautics Membranes are of different ranges.

RO	4 Inch	8 Inch
CPA	CPA2-4040	CPA2 CPA3 CPA4
ESPA	ESPA1-4040 ESPA2-4040 ESPA3-4040 ESPA4-4040	ESPA1 ESPA2 ESPA2-365 ESPA2+ ESPA3 ESPA4 ESPAB
SWC	SWC1-4040	SWC3+ SWC4+ SWC5
LFC		LFC1 LFC3 LFC3-LD
Dairy RO	Dairy RO	Dairy RO
Dairy UF	Dairy UF	Dairy UF
Sweetener		SuPRO
San RO	San RO San RO HS San RO HS2	San RO San RO HS San RO HS2