20" x 4.5" Jumbo System. 20" Big Blue / Jumbo Water Filter Housing. Finerfilters No Salt / Salt Free Water Softener Alternative. 10" x 4.5" Jumbo (BB) Continuous - 8 . The housing is installed on your mains cold water feed for whole house applications and has standard 3/4" BSP inlet and outlet ports so is a simple and straightforward system to install for any plumber.
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