The obstacles included a water "wipeout", sheep dips
, hay bay hurdle and a gladiator gauntlet.
NEW FUW president Glyn Roberts is backing calls for an independent inquiry into OP sheep dips
The 11-strong team ran a six-kilometre race encountering 15 military style obstacles, including ditches, 12ft walls and sheep dips
at the event in Usk.
Symptoms - which include fatigue, blurred vision, and seizures - are said to be similar to those experienced by farmers working with sheep dips
The four cases cited involved organo-phosphate sheep dips
, genetically-modified crops, bovine spongiform encephalopathy (mad cow disease), and mumps, measles, and rubella vaccines.
Their decline in the 20th century was attributable mainly to drainage schemes and pollution - particularly from sheep dips
Last year, pollution incidents involving sheep dips
led to serious environmental damage and fines of up to pounds 38,000.
Baptism by full immersion is an alternative for adults to the traditional sprinkling of water used on babies and it has become increasingly popular for Christians, with sheep dips
a regular fixture in several churches across the UK.
Organophosphates - invented by the Nazis for nerve gases - are also used in sheep dips
, crop sprays and head lice treatments.
The dangers were first revealed by farm workers who used pesticides in sheep dips
and reported a range of devastating health problems.
A certificate had only been necessary for purchasers of organophosphorus sheep dips
, but last May Food Safety Minister Mr Jeff Rooker announced the scheme would be extended to cover all sheep dips
after December 30.
OP compounds are used in a wide range of agricultural products, but sheep dips
are regulated as veterinary medicines rather than pesticides because the matter is classed as one of animal health.