Compare Quick view Pentair PENTAIR | GRID ASSEMBLY - COMPLETE 72 SQ. FT. | 59003700 MSRP: Was: Now: $620.79 PENTAIR | GRID ASSEMBLY - COMPLETE 72 SQ. FT. | 59003700 Parts For FILTER MODELS: 24 | 36 | 48 | 60 | & 72 SQ | FT. ... Add to Cart Add to Cart