ensure maintenance is carried out by a competent person (someone who has the necessary skills, knowledge and experience to carry out the work safely) 1  maintain plant and equipment regularly â use the manufacturerâs maintenance instructions as a guide, particularly if there are safety-critical features.
HDPE (High Density Polyethylene). 3/4 HDPE will cost about $45.00 for 100' ($0.45/ft), so depending on the amount required can be much cheaper than the previous options. HDPE is used by many municipalities as water supply lines, so it has been tried and tested in underground applications.
Sky's HD pack costs an extra Â£5.25 a month, while Virgin Media charge a further Â£7 a month for super fine detail. BT's HD pack costs Â£4 a month, but doesn't include the HD versions of Sky Sports. If the cost doesn't put you off, see our full guide to the best HD TV providers.