# Which is the most likely variable to shift in LSI?

## Which is the most likely variable to shift in LSI?

Play with the numbers on your own to find the balance that works for you and your water. pH: This variable is the most likely to shift up and down, as pool operators already know. In the LSI calculation, the pH value itself (example: 7.2) is the factor. There is no multiplier.

What should the LSI be in perfect equilibrium?

LSI between -0.30 and +0.30 is the widely accepted range, while 0.00 is perfect equilibrium. We at Orenda have designed our LSI Calculator to encourage users to keep their LSI between 0.00 and +0.30, because if you’re going to err one way or the other, we prefer to err high.

### What can an operator do to increase the LSI?

For example, an operator can increase the calcium hardness, or alkalinity. Play with the numbers on your own to find the balance that works for you and your water. pH: This variable is the most likely to shift up and down, as pool operators already know. In the LSI calculation, the pH value itself (example: 7.2) is the factor.

How does calcium hardness relate to the LSI?

Calcium Hardness: This is a measurement of how much calcium is dissolved in the water. Water that is over-saturated with calcium is likely to be more scale forming, but only if the pH and total alkalinity allow for it to come out of solution. Calcium hardness is a very stable factor in water chemistry, and helps bring consistency to the LSI.

#### When did the LSI start requiring low Fael?

2006 LSI rulemaking and 2010 amendments required operators of in-use fleets to achieve specific hydrocarbon (HC) + oxides of nitrogen (NOx) fleet average emission level (FAEL) standards that became more stringent over time, the lowest FAEL for large and medium fleets was to be achieved in 2013.

When do LSI emission standards go into effect?

The 2016 amendments require operators of in-use fleets to report, label LSI equipment, and continue existing recordkeeping requirements previously set to expire June 30, 2016. Maintain records until June 30, 2023. LSI fleets must meet the fleet average emission level standards in the table below.

## When to report LSi equipment to CARB?

Fleets that are newly subject to the FAEL after June 30, 2017 (e.g., new fleets operating in California or fleets that grow from small to large fleet size), must report within 60 days of a fleet becoming subject to the FAEL. After a fleet reports their LSI equipment to CARB, each piece of equipment is assigned a unique EIN.

LSI between -0.30 and +0.30 is the widely accepted range, while 0.00 is perfect equilibrium. We at Orenda have designed our LSI Calculator to encourage users to keep their LSI between 0.00 and +0.30, because if you’re going to err one way or the other, we prefer to err high.