These filters are capable of being filled solely with filter sand for domestic filters, the use of Pea Gravel is normally for commercial installations.
The use of Pea gravel is primarily to allow a more even flow around the bottom of the filter, and reduce bacterial growth in the dead spot of the filter & increase the effectiveness of the backwash process, but due to the medium flow rate sand filters used for domestic pool, this is not necessary. If however these filters are to be used in a commecial environment, then pea gravel is recommended.
Should you wish to order the pea gravel for your filter, please look at the media table below to order the required amount of sand & gravel for your size of filter.
Always fill you filter 1/3 full of water before filling with any filter media, as this will help to lessen the impact of the media hitting the fragile laterals in the bottom of the filter. If you are using Pea Gravel, you must ensure that the gravel forms a level layer at the bottom of the filter first, and only just covers the laterals, if you over fill with Pea Gravel you will reduce the efficiency of your filter by reducing the depth & area of filtration available.
19" filter requires 100kg's of filter sand - (Commercial 75kg of sand for 25kg of pea Gravel)
24" filter requires 175kg's of filter sand - (Commercial 150kg of sand for 25kg of pea Gravel)
30" filter requires 300kg's of filter sand - (Commercial 250kg of sand for 50kg of pea Gravel)
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