Under gravel filters do not work very well on terrapins.

The under gravel filter works on the principle of water displacement.

You would be directly over a sub gravel filter is not recommended.

The cost of constructing an additional cell(s) and gravel filter.

Discharge from the main (existing) pond through a gravel filter.

If using an under gravel filter place the plates supplied on the tank base.

A basic tank with an air driven under gravel filter is fine for goldfish.

An air driven under gravel filter is the most suitable filter.

This increased water flow increases the amount of oxygen available to the bacteria and therefore makes the under gravel filter more efficient.

Steel melter slag was used in the gravel filter beds at Waiuku.

Residents have no sewage network and must use septic tanks, which often have sand or gravel filters.

It was suggested to them that a gravel filter would absorb noise of the wheel scream that emanates only 2 to 4 m away.

Phil Robinson's diagram shows Martin Chandler's easily made drinks bottle gravel filter.

Filtration using a gravel filter bed is consistent with the adoption of the operationally simple pond system that utilises essentially natural processes.

The Ultra-Clear Under gravel Filter provides biological filtration at the same time.

Includes black 4 door cabinet and hood, heater, light, external cannister filter, gravel filters, plants, wood and rocks.

The sequential treatment process will consist of: inlet screen three stage aerated lagoon system. subsurface flow gravel filter.

Effluent from the gravel filter collected in a chamber and pumped to the existing discharge in the Piako River.

The carbon cartridges in your Ultra-Clear Under gravel Filter need to be replaced every 4-6 weeks, or more often, depending on fish population.

Material for the sand and gravel filter zones and blanket drain will likely come from screened glacial deposits from the valley slopes.

The gravel filter beds provide an effective means of removing remaining BOD and suspended solids from the lagoon effluent.

Of the options considered, the addition of a maturation pond and gravel filter is likely to achieve the best result for the lowest capital and operating cost.

Indeed, plants growing in a typical traditional gravel filter bed, with water circulated using electric powerhead pumps, are in effect being grown using gravel hydroponics.

Maturation Pond plus Gravel Filter This is the lowest cost option for reducing faecal coliforms by using natural UV (sunlight).

Crystal Pio II power filter to assist underwater gravel filter (150 Ltrs P/H cycle).