Watkins Mfg Corp. No. 31489 (see end cap of filter) Hot Spring C30 Filter Cartridge
- Solana SZ square with plastic or redwood sides
- Solana TZ Triangle
- Solana RX Round with plastic sides
- Vista. (all years 1990-Current)
Filters made from high performance silicone with central contortion band. These filters out perform the alternative filters in durability and effectiveness.
- 0.50 KGS