Our digital meter is simple to install and operate. The simplest of equipment makes life so much easier. Calculate correct pond volume, accurate treatments and know when uour chlorine and/or chloromine filter needs replacing. Call us to order 01507 523314. Chloromine filters and cartridges available. The simplest of equipment makes life so much easier. Calculate correct pond volume, accurate treatments and know when uour chlorine and/or chloromine filter needs replacing. Call us to order 01507 523314. Chloromine filters and cartridges available.